Ben 10 (2005) (TV Series)
Rex tells Six he needs a theme song, then proceeds to sing a theme he's thought of. The song is a parody of original Ben 10 series opening reworded for Rex. And when he's singing the theme song, the music is playing in the background.

See also

Trivia | Goofs | Crazy Credits | Quotes | Alternate Versions | Soundtracks

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