Fraggle Rock (UK)

The Preachification of Convincing John (1x7)

:

The Captain decides that Sprocket is too fat and, ignoring the dog's protest, puts him on a diet. Inside Fraggle Rock Mokey decides that the time has come for the Fraggles to stop eating the Doozers' beautiful constructions and enlists the persuasive powers of Convincing John — with unexpected results.