A Gummi in a Gilded Cage

Sunni is kidnapped by a flock of ugly bird-like creatures known as Carpies, whose king wants her for a song bird. The male Gummis must use their new flying machine to get to the top of the mountain and rescue her, all while Gruffi and Zummi must deal with their acrophobia and Gruffi's insistence that "Gummis were not meant to fly".