Question: Writer Romeo Muller and actor Jackie Vernon worked in a 1976 animated Christmas television special which is owned by who? 

Related documents: [0]  [DOC] Rankin/Bass Productions, Inc. (founded as Videocraft International, Ltd.) was an American production company, known for its seasonal television specials, particularly its work in stop motion animation. The pre-1974 library is owned by Universal Studios (via DreamWorks Animation/DreamWorks Classics), while the post-1973 library is owned by Warner Bros. Rankin/Bass stop-motion features are recognisable by their visual style of doll-like characters with spheroid body parts, and ubiquitous powdery snow using an animation technique called "Animagic". Often, traditional cel animation scenes of falling snow would be projected over the action to create the effect of a snowfall. [END] 
[1]  [DOC] Frosty's Winter Wonderland is a 1976 animated Christmas television special and a sequel to the 1969 special "Frosty the Snowman", produced by Rankin/Bass Productions. It returns writer Romeo Muller and actor Jackie Vernon as the voice of Frosty, while Andy Griffith stars as the narrator. The special premiered on ABC on December 2, 1976. [END]  
Answer: by Warner Bros.
by Warner Bros.