Fraggle Rock: The Animated Series (1987)

S1E2 Big Trouble for a Little Fraggle

Wembley accidentally discovers a magical stone that causes him to grow to a gigantic size. Excited but confused, he bolts out of Fraggle Rock and finds himself in the Gorgs' Garden. There, Junior Gorg sees him and mistakenly believes that Wembley is a distant cousin of the Gorg family.