Dr. Slump Movie 04: Arale-chan Hoyoyo! Nanaba Shiro no Hihou
English title: Dr. Slump and Arale-chan: Hoyoyo! The Treasure of Nanaba Castle
Japanese title: Ｄｒ．スランプ アラレちゃん ほよよ！ナナバ城の秘宝
Alternative titles: Dr. Slump & Arale-chan HoYoYo! The Treasure of Nanaba Castle, Dr. Slump: Arale-chan Hoyoyo! Nanabajou no Hihou
Type: Movie
Source: Manga
Episodes: 1
Status: Finished Airing
Aired: Dec 22, 1984
Duration: 48 min
Rating: PG-13 - Teens 13 or older
Studios: Toei Animation
Licensors: Discotek Media
Genres: Comedy, Sci-Fi
Themes: Gag Humor
Demographics: Shounen

Dr. Slump found the secret treasure named “Eye of Rainbow” of legendary Nanaba Castle in the mountain. This treasure makes every dream come true. When the robbery gang of Arale, Ga-chan tried to steal this treasure, Bisna who is the descendant of Nanaba Kingdom took the treasure. Bisna wanted to revive the devil and Nanaba Kingdom. Arale and her friends went towards the secret Nanaba Castle to get back the treasure. 

(Source: Official Website)