Dr. Slump and Arale-chan: Hoyoyo! City of Dreams, Mechapolis (1985)
Original title: Dr.スランプ アラレちゃん ほよよ!夢の都メカポリス
Dr. Slump and Arale-chan: Hoyoyo! City of Dreams, Mechapolis is a 1985 Japanese-language comedy movie directed by Toyoo Ashida and Kazuhisa Takenouchi, with a running time of 38m. It stars Mami Koyama, Kenji Utsumi and Mitsuko Horie.
Children are lured to Metropolis only to find that the renowned, mythical city may not be the happy-go-lucky utopia they'd thought it would be.