Disney's Adventures of the Gummi Bears (1985)
S03E12 The Knights of Gummadoon
Episode Overview
As the knights of Gummadoon's castle materializes, Cavin finds himself locked away, accused of being a spy. The Gummies must act fast—they have until sunset to save him, since the castle only shows up once every century. However, they face a significant challenge: Duke Igthorn has his own plans to seize control of the castle for himself.