We Wish You a Merry Christmas (song)

 We Wish You a Merry Christmas is a popular Christmas carol.

The song was first heard in the first season episode. Thomas' Christmas Party. Instrumnetal versions can be heard in the episodes Thomas and the Missing Christmas Tree and Thomas and Percy's Christmas Adventure.

Trivia

 * Without Ringo Starr or George Carlin's vocals, two other voices can be heard. Presumably, they are the voices of Mike O'Donnell and Junior Campbell.