Robot Land

S1, E6: A swan flies into Astro's home and turns into Princess Odette. But Devil King, who has chased after her, takes her back. Dr. Elephant and Astro visit an island called Robot Land, made by Dr. Hyde who is Dr. Elephant's former colleague at the Ministry of Science. Dr. Elephant resents the robot abuse that occurs there. The next day Astro sneaks onto the island but is caught. His classmates reveal that Dr. Hyde is secretly producing weapons and the robots revolt. Astro defeats Devil King.