Marvin appeared in the 1975 Julie Andrews TV special One to One. He was the same puppet used for Leo in the Muppet Meeting Films.

In the special, Kermit tells the story of the sun-deprived Kingdom of Phumph, which consists only of a king, a queen, a prince, and one subject, a young multi-tasker named Marvin who becomes king by adopting a doorstep child, thus making the sun shine in the kingdom.