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EXHIBIT 21
 As of December 31, 2006
 A table of subsidiaries of Discovery Holding Company is set forth below, indicating as
to each the state or jurisdiction of organization and the names under which such
subsidiaries do business. Subsidiaries not included in the table are inactive or,
considered in the aggregate as a single subsidiary, would not constitute a significant
subsidiary.
 State/CountryName
    
    of Formation4MC Limited
    
    UKAFA Products Group, Inc.
    
    NJAscent Media (Singapore) Pte. Ltd.
    
    SINGAPOREAscent Media CANCOM, Inc. [dba A3]
    
    DEAscent Media CANS, LLC
    
    DEAscent Media Creative Services, Inc. [dba R!OT Santa
Monica; R!OT Manhattan; R!OT Atlanta; Digital Symphony;
Encore Hollywood; Level 3 Post; Method; POP Sound;
FilmCore Editorial Santa Monica; FilmCore Distribution
Hollywood; FilmCore Editorial San Francisco; FilmCore
Distribution San Francisco; FilmCore Editorial New York]
    
    CAAscent Media Creative Sound Services, Inc. [dba Modern
Music; Signet Sound; Soundelux Design Music Group;
Soundelux; The Hollywood Edge; Todd-AO Burbank; Todd-AO
Hollywood; Todd-AO Radford; Todd-AO Vine Street Studios;
Todd-AO West]
    
    NYAscent Media GP Ltd.
    
    UKAscent Media Group (Isle of Man) Limited
    
    ISLE OF MANAscent Media Group Limited
    
    UKAscent Media Group, LLC [dba Visiontext]
    
    DEAscent Media Holdings Limited
    
    UKAscent Media Holdings Ltd.
    
    SINGAPOREAscent Media Holdings, Inc.
    
    DEAscent Media Limited
    
    UKAscent Media Management Services, Inc.[dba Level 3 Post;
Digital Transform; Ascent Media DVD Burbank; Ascent
Media Laboratory; Ascent Media Management Services:Burbank; Ascent Media Management Services: Hollywood;
Ascent Media Syndication Services; Ascent Media Digital
Media Center; Ascent Media Vault; Ascent Media
Management Services East; Blink Digital; Cinetech]
    
    DEAscent Media Network Services Europe Limited
    
    UKAscent Media Network Services, LLC [dba Vido Rentals]
    
    CAAscent Media Pte. Ltd.
    
    SINGAPOREAscent Media Systems & Technology Group, Inc.
    
    DEAscent Media Systems & Technology Services Limited
    
    UKAscent Media Systems and Technology Services, LLC
    
    DEAscent Media UK Limited Partnership
    
    UKBobco Productions, LLC [dba Method Labs; Lucy Films]
    
    DECo 3 London Limited
    
    UKCompany 3 New York, Inc.
    
    DECompany 3, Inc.[dba Company 3; CO3]
    
    DEDHC Pramer Acquisition, Inc.
    
    DEFour Media Company, LLC [dba Digital Image, Image
Laboratory; Method; Todd Studios Burbank; Todd Burbank;
Stream]
    
    DEHyper TV Productions, LLC
    
    CALiberty Animal, Inc.
    
    DELiberty Livewire Limited
    
    UKLiberty Livewire LLC
    
    DELMC Discovery, Inc.
    
    COLondon Playout Centre Limited
    
    UKMethod London Limited
    
    UKOne Post Limited
    
    UKR!OT London Limited
    
    UKRushes PostProduction Limited
    
    UKRushes Television S.A. de C.V.
    
    MEXICOServicios Administrativos de Post Produccion S.A. de C.V.
    
    MEXICOSoho 601 Digital Productions Limited
    
    UKSoho Group Limited
    
    UKSoho Images Limited
    
    UKSound One Corporation
    
    NYSoundelux London Limited
    
    UKSt. Annes Post Limited
    
    UKStream Digital Media Limited
    
    UKStudio Film and Video Holdings Limited
    
    UKSVC Television Limited
    
    UKTele-Cine Limited
    
    UKTGS, Inc.
    
    VAThe London Switch Limited
    
    UKTodd A-O Europe Holding Company Limited
    
    UKTodd-AO Filmatic Limited
    
    UKTodd-AO UK Limited
    
    UKTodd-AO, Espana
    
    CATVI Limited
    
    UKTVP Videodubbing Limited
    
    UKVideo Time 1999 Limited
    
    UKVisiontext Limited
    
    UKVSC MAL CORP.
    
    DEXTV Limited
    
    UK