Exhibit 99.3

EXECUTION VERSION

VOTING AGREEMENT

This VOTING AGREEMENT, is made and entered into as of July 30, 2017 (this “Agreement”), by and among the stockholder appearing on the signature page hereto (the “Stockholder”), Discovery Communications, Inc., a Delaware corporation (“Parent”), and Scripps Networks Interactive, Inc., an Ohio corporation (the “Company”).

RECITALS

WHEREAS, as of the date hereof, the Stockholder is the Beneficial Owner of the number of shares of Series A Preferred Stock set forth opposite the Stockholder’s name on Schedule A hereto (such shares, the “Old Preferred Shares”);

WHEREAS, pursuant to the Exchange Transaction, the Stockholder will exchange all of the Series A Preferred Stock and Series C Preferred Stock Beneficially Owned by it immediately before the closing of the Exchange Transaction for a number of shares of Parent’s Series A-1 Convertible Participating Preferred Stock, par value $0.01 per share (“Series A-1 Preferred Stock”) and Series C-1 Convertible Participating Preferred Stock, par value $0.01 per share (“Series C-1 Preferred Stock”) (the shares of Series A-1 Preferred Stock so received by the Stockholder, together with such additional shares of capital stock of Parent (other than shares of Series C Preferred Stock, Series C-1 Preferred Stock or Series C Common Stock) that become Beneficially Owned by the Stockholder, whether upon the closing of the Exchange Transaction, the exercise of options, conversion of convertible securities or otherwise, after the date hereof until the Expiration Date, the “Subject Shares”; for the avoidance of doubt, Subject Shares shall not include the Old Preferred Shares except for in the event that the Exchange Agreement is terminated prior to the Parent Stockholders Meeting, the Subject Shares shall be deemed to include the Old Preferred Shares);

WHEREAS, concurrently with the execution of this Agreement, Parent, Skylight Merger Sub, Inc., an Ohio corporation and a direct wholly owned subsidiary of Parent (“Merger Sub”), and the Company, are entering into an Agreement and Plan of Merger, dated as of the date hereof in the form attached hereto in Annex A (the “Merger Agreement”), pursuant to which, upon the terms and subject to the conditions thereof, Merger Sub will be merged with and into the Company (the “Merger”), with the Company surviving the Merger as a wholly owned subsidiary of Parent;

WHEREAS, the board of directors of Parent has unanimously by those voting (i) determined that the terms of the Merger Agreement, the Merger and the other transactions contemplated by the Merger Agreement are fair to, and in the best interests of, Parent and its stockholders, (ii) determined and declared advisable the Merger Agreement and the transactions contemplated thereby and (iii) resolved to recommend that Parent stockholders vote in favor of the issuance of shares of Series C Common Stock in connection with the Merger and directed that such matter be submitted for consideration of the stockholders of Parent at the Parent Stockholders Meeting; and

WHEREAS, as a condition and inducement to the willingness of the Company and Parent to enter into the Merger Agreement, the Company and Parent have required that the Stockholder enter into this Agreement, and the Stockholder desires to enter into this Agreement to induce the Company and Parent to enter into the Merger Agreement;

NOW, THEREFORE, in consideration of the foregoing and the mutual covenants and agreements contained herein, and intending to be legally bound hereby, the parties hereby agree as follows:

1. Voting of Shares. From the period commencing with the execution and delivery of this Agreement and continuing until the Expiration Date, at every meeting of holders of capital stock of Parent called with respect to any of the following, and at every adjournment or postponement thereof, and on every action or approval by written consent of the holders of shares of capital stock of Parent with respect to any of the following, the Stockholder shall vote or cause to be voted the Subject Shares that the Stockholder is entitled to vote:

(a) in favor of the issuance of shares of Series C Common Stock in connection with the Merger;

(b) against any Parent Acquisition Proposal or any Parent Superior Proposal; and

(c) against any amendment of the Parent Certificate of Incorporation, Parent Bylaws or other action or agreement of Parent, in each case for which the vote of the applicable class of capital stock of Parent is required to authorize such action or agreement, that would reasonably be expected to (i) result in a breach of any covenant, representation or warranty or any other obligation or agreement of Parent under the Merger Agreement (it being understood that the consummation of the Exchange Transaction is expressly contemplated and permitted under the Merger Agreement), (ii) result in any of the conditions to the consummation of the Merger under the Merger Agreement not being fulfilled, or (iii) impede, frustrate, interfere with, delay, postpone or adversely affect the Merger and the other transactions contemplated by the Merger Agreement; provided that the Company has advised the Stockholder of such asserted effect set forth in clause (i), (ii) or (iii) in writing at least ten (10) Business Days prior to the applicable vote.

2. Transfer of Shares. The Stockholder agrees that from and after the date of this Agreement until the receipt of the Parent Requisite Vote, the Stockholder will not, directly or indirectly, (i) sell, transfer, distribute, pledge, hypothecate, donate, assign, appoint or otherwise dispose of or encumber (“Transfer”), any of the Subject Shares; provided, that nothing in this clause (i) shall prohibit any of the transactions contemplated by the Exchange Transaction or the Exchange Agreement (including the distribution or release of certain series A Preferred Stock to Parent in accordance with the Escrow Agreement (as defined under the Exchange Agreement)) or any Transfer by the Stockholder of any shares of Series C Preferred Stock or Series C Common Stock, (ii) deposit any of the Subject Shares into a voting trust or enter into a voting agreement

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or arrangement with respect to the Subject Shares or grant any proxy or power of attorney with respect thereto, (iii) enter into any contract, option or other arrangement or undertaking with respect to the Transfer of any Subject Shares, (iv) enter into any agreement, arrangement or understanding with any Person (other than the Company), or take any other action, that would conflict with, restrict, limit, violate or interfere with the performance of the Stockholder’s representations, warranties, covenants and obligations hereunder or (v) take any action that would reasonably be expected to restrict or otherwise adversely affect the Stockholder’s legal power, authority and right to comply with and perform its covenants and obligations under this Agreement. Any Transfer in violation of this provision shall be void ab initio. The foregoing restrictions on Transfers of Subject Shares shall not prohibit any such Transfers by the Stockholder in connection with the Merger or the transactions contemplated by the Merger Agreement.

3. Acquisition Proposals. The Stockholder shall not and shall not direct any of its Representatives to, directly or indirectly, (i) solicit, initiate or knowingly facilitate (including by way of furnishing information), induce or encourage any inquiries or the making of any proposal or offer (including any proposal or offer to the stockholders of Parent) that constitutes, or could reasonably be expected to lead to, a Parent Acquisition Proposal, (ii) enter into, continue or otherwise participate in any discussions or negotiations regarding, or furnish to any Person any information with respect to, or cooperate in any way that could otherwise reasonably be expected to lead to, any Parent Acquisition Proposal or (iii) approve or recommend, or make any public statement approving or recommending, any inquiry, proposal or offer which constitutes, or could reasonably be expected to lead to, a Parent Acquisition Proposal, and Stockholder shall not, alone or together with any other Person, make a Parent Acquisition Proposal. If the Stockholder receives any inquiry or proposal regarding any Parent Acquisition Proposal, the Stockholder shall promptly inform the Company of such inquiry or proposal and the details thereof.

4. Additional Covenants of the Stockholder.

(a) Further Assurances. From time to time and without additional consideration, the Stockholder shall execute and deliver, or cause to be executed and delivered, such additional instruments, and shall take such further actions, as are reasonably necessary in order to perform its obligations under this Agreement.

(b) Stock Dividends, etc. In the event of a stock split, stock dividend or distribution, or any change in the shares of capital stock of Parent by reason of any split-up, reverse stock split, recapitalization, combination, reclassification, reincorporation, exchange of shares or the like, the terms “shares of capital stock of Parent” and “Subject Shares” shall be deemed to refer to and include such shares as well as all such stock dividends and distributions and any securities into which or for which any or all of such shares may be changed or exchanged or which are received in such transaction.

(c) Notice of Acquisitions. The Stockholder hereby agrees to notify the Company and Parent in writing as promptly as practicable of the number of any additional shares of Series A Common Stock, Series A Preferred Stock or voting

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securities of Parent of which the Stockholder acquires Beneficial Ownership on or after the date hereof; provided that any timely filing with the SEC by the Stockholder pursuant to Section 13 or Section 16 of the Exchange Act reporting any such acquisition shall constitute notice with respect to this Section 4(c).

(d) Disclosure. Subject to reasonable prior notice (including reasonable opportunity to review and comment) and approval (not to be unreasonably withheld, conditioned or delayed) of the Stockholder, the Stockholder hereby authorizes the Company and Parent to publish and disclose in any announcement or disclosure required by the SEC, including in the Joint Proxy Statement/Prospectus, the Stockholder’s identity and ownership of the Stockholder’s Subject Shares and the nature of the Stockholder’s obligations under this Agreement.

5. Representations and Warranties of the Stockholder. The Stockholder on its own behalf hereby represents and warrants as of the date hereof to the Company and Parent with respect to the Stockholder and the Stockholder’s ownership of the Subject Shares as follows:

(a) Authority. The Stockholder has all requisite power and authority to enter into this Agreement and to consummate the transactions contemplated hereby. This Agreement has been duly authorized, executed and delivered by the Stockholder and constitutes a valid and binding obligation of the Stockholder enforceable in accordance with its terms, subject to the Bankruptcy and Equity Exception. Other than as provided in the Merger Agreement and any filings by the Stockholder with the SEC, the execution, delivery and performance by the Stockholder of this Agreement does not require any consent, approval, authorization or permit of, action by, filing with or notification to any Governmental Entity, other than any consent, approval, authorization, permit, action, filing or notification the failure of which to make or obtain would not, individually or in the aggregate, be reasonably expected to prevent or materially delay the consummation of the Merger.

(b) No Conflicts. Neither the execution and delivery of this Agreement, nor the consummation of the transactions contemplated hereby, nor compliance with the terms hereof, will violate, conflict with or result in a material breach of, or constitute a default (with or without notice or lapse of time or both) under any provision of, any trust agreement, other agreement, judgment, order, decree, statute, law, ordinance, rule or regulation applicable to the Stockholder.

(c) The Subject Shares. The Stockholder is the Beneficial Owner of and has good and marketable title to the Old Preferred Shares, and will be the Beneficial Owner of and have good and marketable title to the number of shares of Series A-1 Preferred Stock equal to the Series A-1 Share Amount (as defined under the Exchange Agreement), upon consummation of the Exchange Transaction, free and clear of any and all security interests, liens, encumbrances, equities, claims, options or limitations of whatever nature (including any restriction on the right to vote, sell or otherwise dispose of such Subject Shares). The Stockholder does not Beneficially Own any shares of Series A Common Stock, Series B Common Stock or Series A Preferred Stock other than the Old Preferred

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Shares. After the consummation of the Exchange Transaction, the Stockholder will not Beneficially Own any shares of Series A Common Stock, Series B Common Stock, Series A Preferred Stock or Series A-1 Preferred Stock other than the Subject Shares. The Stockholder has, or will have at the time of the applicable meeting of holders of shares of capital stock of Parent, the sole right to vote or direct the vote of, or to dispose of or direct the disposition of, such Subject Shares. None of the Subject Shares is subject to any agreement, arrangement or restriction with respect to the voting of such Subject Shares that would prevent or delay the Stockholder’s ability to perform its obligations hereunder. Except for the Exchange Agreement, there are no agreements or arrangements of any kind, contingent or otherwise, obligating the Stockholder to Transfer, or cause to be Transferred, any of the Subject Shares and no Person has any contractual or other right or obligation to purchase or otherwise acquire any of such Subject Shares other than the Stockholder in the Exchange Transaction.

(d) Reliance by the Company and Parent. The Stockholder understands and acknowledges that the Company and Parent are entering into the Merger Agreement in reliance upon the Stockholder’s execution and delivery of this Agreement.

(e) Litigation. As of the date hereof, to the knowledge of the Stockholder, there is no action, proceeding or investigation pending or threatened in writing against the Stockholder that questions the validity of this Agreement or any action taken or to be taken by the Stockholder in connection with this Agreement.

6. Exchange Transaction. Parent and the Stockholder shall consummate the Exchange Transaction on the seventh (7th) Business Day (as defined in the Exchange Agreement) following the date hereof or as promptly as practicable thereafter.

7. Representations and Warranties of the Company. The Company represents and warrants to the Stockholder and Parent as follows: the Company is a corporation duly incorporated, validly existing and in good standing under the Laws of the State of Ohio and has full corporate power and authority to execute and deliver this Agreement and to consummate the transactions contemplated hereby. The execution and delivery of this Agreement and the Merger Agreement by the Company and the consummation of the transactions contemplated hereby and thereby have been duly and validly authorized by the board of directors of the Company, and no other corporate proceedings on the part of the Company are necessary to authorize the execution, delivery and performance of this Agreement, the Merger Agreement by the Company and, subject to receipt of the Company Requisite Vote, the consummation of the transactions contemplated hereby and thereby. The Company has duly and validly executed this Agreement, and this Agreement constitutes a legal, valid and binding obligation of the Company enforceable against the Company in accordance with its terms, subject to the Bankruptcy and Equity Exception.

8. Representations and Warranties of Parent. Parent represents and warrants to the Stockholder and the Company as follows: Parent is a corporation duly incorporated, validly existing and in good standing under the Laws of the State of Delaware and has full corporate power and authority to execute and deliver this

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Agreement and to consummate the transactions contemplated hereby. The execution and delivery of this Agreement and the Merger Agreement by Parent and the consummation of the transactions contemplated hereby and thereby have been duly and validly authorized by the board of directors of Parent, and no other corporate proceedings on the part of Parent are necessary to authorize the execution, delivery and performance of this Agreement, the Merger Agreement by Parent and, subject to receipt of the Parent Requisite Vote, the consummation of the transactions contemplated hereby and thereby. Parent has duly and validly executed this Agreement, and this Agreement constitutes a legal, valid and binding obligation of Parent enforceable against Parent in accordance with its terms, subject to the Bankruptcy and Equity Exception.

9. Stockholder Capacity. No Stockholder executing this Agreement who is or becomes during the term hereof a director or officer of Parent shall be deemed to make any agreement or understanding in this Agreement in such Person’s capacity as a director or officer. The Stockholder is entering into this Agreement solely in the Stockholder’s capacity as the Beneficial Owner of Subject Shares and nothing herein shall limit or affect any actions taken (or any failures to act) by the Stockholder in the Stockholder’s capacity as a director or officer of Parent. The taking of any actions (or any failures to act) by the Stockholder (including voting on matters put to the board of directors of Parent or any committee thereof, influencing officers, employees, agents, management or the other directors of Parent and taking any action or making any statement at any meeting of such board or any committee thereof) in the Stockholder’s capacity as a director or officer of Parent shall not be deemed to constitute a breach of this Agreement, regardless of the circumstances related thereto.

10. Certain Definitions. Capitalized terms used and not otherwise defined herein shall have the respective meanings ascribed to them in the Merger Agreement.

(a) “Beneficial Ownership” and related terms such as “Beneficially Owned” or “Beneficial Owner” have the meaning given such terms in Rule 13d-3 under the Exchange Act, and the rules and regulations promulgated thereunder, as in effect from time to time.

(b) “Exchange Agreement” means that Exchange Agreement , dated as of the date hereof, between Parent and the Stockholder in the form attached hereto as Annex B.

(c) “Exchange Transaction” means the exchange of all of the outstanding shares of Series A Preferred Stock and Series C Preferred Stock Beneficially Owned or owned of record by the Stockholder immediately prior to the Closing (as defined under the Exchange Agreement) for a number of shares of Series A-1 Preferred Stock equal to the Series A-1 Share Amount (as defined under the Exchange Agreement) and a number of shares of Series C-1 Preferred Stock equal to the Series C-1 Share Amount (as defined under the Exchange Agreement) in accordance with the Exchange Agreement.

11. Termination. This Agreement shall automatically terminate without further action upon the earliest to occur (the “Expiration Date”) of (i) the Effective Time, (ii) the termination of the Merger Agreement in accordance with its terms, (iii) the

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effectiveness of any amendment to the Merger Agreement that is not expressly contemplated by the stockholder written consent delivered by the Stockholder to Parent concurrently with the execution of the Merger Agreement, and (iv) the written agreement of the Stockholder, Parent and the Company to terminate this Agreement.

12. Specific Performance. The Stockholder acknowledges and agrees that (i) the covenants, obligations and agreements contained in this Agreement relate to special, unique and extraordinary matters, (ii) the Company and Parent are relying on such covenants in connection with entering into the Merger Agreement and (iii) a violation of any of the terms of such covenants, obligations or agreements will cause the Company and Parent irreparable injury for which adequate remedies are not available at law and for which monetary damages are not readily ascertainable. Therefore, each of the Stockholder, the Company and Parent agree that the parties hereunder shall be entitled to an injunction, restraining order or such other equitable relief (without the requirement to post bond), in addition to remedies at law or in damages, as a court of competent jurisdiction may deem necessary or appropriate to restrain the Stockholder from committing any violation of such covenants, obligations or agreements, and shall not oppose the granting of such relief on the basis that the Company or Parent has an adequate remedy at law or in damages.

13. Governing Law and Venue; Waiver of Jury Trial.

(a) THIS AGREEMENT SHALL BE DEEMED TO BE MADE IN AND IN ALL RESPECTS SHALL BE INTERPRETED, CONSTRUED AND GOVERNED BY AND IN ACCORDANCE WITH THE LAW OF THE STATE OF DELAWARE WITHOUT REGARD TO THE CONFLICT OF LAW PRINCIPLES THEREOF.

(b) Each of the parties hereby irrevocably submits exclusively to the jurisdiction of the Chancery Courts of the State of Delaware and the federal courts of the United States of America, in each case, located in New Castle County in the State of Delaware and hereby waives, and agrees not to assert, as a defense in any action, suit or proceeding for the interpretation or enforcement hereof, that it is not subject thereto or that such action, suit or proceeding may not be brought or is not maintainable in said courts or that the venue thereof may not be appropriate or that this Agreement may not be enforced in or by such courts, and each of the parties hereto irrevocably agrees that all claims relating to such action, suit or proceeding shall be heard and determined in such a state or federal court. The parties hereby consent to and grant any such court jurisdiction over the person of such parties and over the subject matter of such dispute and agree that mailing of process or other papers in connection with any such action or proceeding in the manner provided in Section 18 or in such other manner as may be permitted by Law, shall be valid and sufficient service thereof.

(c) EACH PARTY ACKNOWLEDGES AND AGREES THAT ANY CONTROVERSY WHICH MAY ARISE UNDER THIS AGREEMENT IS LIKELY TO INVOLVE COMPLICATED AND DIFFICULT ISSUES, AND THEREFORE EACH SUCH PARTY HEREBY IRREVOCABLY AND UNCONDITIONALLY WAIVES ANY RIGHT SUCH PARTY MAY HAVE TO A TRIAL BY JURY IN RESPECT OF

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ANY LITIGATION DIRECTLY OR INDIRECTLY ARISING OUT OF OR RELATING TO THIS AGREEMENT, OR THE TRANSACTIONS CONTEMPLATED BY THIS AGREEMENT. EACH PARTY CERTIFIES AND ACKNOWLEDGES THAT (i) NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER, (ii) EACH SUCH PARTY UNDERSTANDS AND HAS CONSIDERED THE IMPLICATIONS OF THIS WAIVER, (iii) EACH SUCH PARTY MAKES THIS WAIVER VOLUNTARILY, AND (iv) EACH SUCH PARTY HAS BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION 13.

14. Modification or Amendment. This Agreement may be amended, modified or supplemented only in writing by the parties hereto.

15. Waivers. Any provision of this Agreement may be waived if, and only if, such waiver is in writing and signed by the party against whom the waiver is to be effective. No failure or delay by any party in exercising any right, power or privilege hereunder shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. Except as otherwise herein provided, the rights and remedies herein provided shall be cumulative and not exclusive of any rights or remedies provided by Law.

16. Assignment. This Agreement shall not be assignable by operation of Law or otherwise. Any assignment in contravention of the preceding sentence shall be null and void.

17. No Third-Party Beneficiaries. This Agreement is not intended to confer upon any Person other than the parties any rights or remedies.

18. Notices. All notices, requests, claims, demands and other communications under this Agreement shall be in writing and shall be deemed given (i) on the date of delivery if delivered personally or sent via facsimile or e-mail or (ii) on the first Business Day following the date of dispatch if sent by a nationally recognized overnight courier (providing proof of delivery), in each case to the parties at the following addresses (or at such other address for a party as shall be specified by like notice); provided that should any such delivery be made by facsimile or e-mail, the sender shall also send a copy of the information so delivered on or before the next Business Day by a nationally recognized overnight courier:

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19. Severability. The provisions of this Agreement shall be deemed severable and the invalidity or unenforceability of any provision shall not affect the validity or enforceability of the other provisions hereof. If any provision of this Agreement, or the application thereof to any Person or any circumstance, is invalid or unenforceable, (a) the parties shall negotiate in good faith to modify this Agreement to carry out, so far as may be valid and enforceable, the intent and purpose of such invalid or unenforceable provision and (b) the remainder of this Agreement and the application of such provision to other Persons or circumstances shall not, subject to clause (a) above, be affected by such invalidity or unenforceability, except as a result of such modification, nor shall such invalidity or unenforceability affect the validity or enforceability of such provision, or the application thereof, in any other jurisdiction.

20. Entire Agreement. This Agreement and the Exchange Agreement constitute the entire agreement between the parties with respect to the subject matter hereof and supersedes all prior agreements and understandings between the parties with respect thereto.

21. Headings. The headings contained in this Agreement are for reference purposes only and shall not affect in any way the meaning or interpretation of this Agreement.

22. Counterparts; Effectiveness. This Agreement may be executed in any number of counterparts (including by facsimile or by attachment to electronic mail in portable document format (PDF) or by other electronic means), each such counterpart being deemed to be an original instrument, and all such counterparts shall together constitute the same agreement, and shall become effective when one or more counterparts have been signed by each of the parties hereto and delivered to the other parties hereto.

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23. No Ownership Interests. Nothing contained in this Agreement shall be deemed to vest in Parent or the Company any direct or indirect ownership or incidence of ownership of or with respect to any Subject Shares. All rights, ownership and economic benefits of and relating to the Subject Shares shall remain vested in and belong to the Stockholder. Nothing in this Agreement shall be interpreted as creating or forming a “group” with any other Person, including Parent and the Company, for the purposes of Rule 13d-5(b)(1) of the Exchange Act or for any other similar provision of applicable Law.

[SIGNATURE PAGES FOLLOW]

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IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above written.

[Signature Page To Voting Agreement]

IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of the date first above written.

[Signature Page To Voting Agreement]

SCHEDULE A

ANNEX A

MERGER AGREEMENT

ANNEX B

PREFERRED SHARE EXCHANGE AGREEMENT

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