Dr. Slump Movie 05: Arale-chan Hoyoyo! Yume no Miyako Mechapolis

Dr.スランプ アラレちゃん ほよよ! 夢の都メカポリス

Arale and her friends from Penguin Village, after watching a movie that mentions Mechapolis, a mecha city, express a desire that it was real. That same night all the children get abducted and end up in the real Mechapolis! They learn that for that night every wish they have will be granted. What could possibly go wrong... (Source: M74)