Song of the Night 'n Dale (S02E31)

During a test flight of the Ranger Wing plane, the Rescue Rangers get caught in the jet stream which carries them to a hidden, oriental valley in the Himalayas. They meet Chirp-Sing, a nightingale and former pet of Emperor Dim-Sum, who has been banished by Su-Lin, the Emperor's sister. She claims the bird is a demon who is driving her brother crazy with nightmarish visions. Actually, it is Su-Lin, using a hallucinatory gas and mechanical figures, who is trying to dethrone the Emperor. She plans to sell out the valley and fill it with condominiums. So the Rangers decide to give Su-Lin a taste of her own medicine to get her to confess. Their plan works and Su-Lin's scheme is exposed. (iTunes)