Kaettekita Dr. Slump: Arale-chan Special
Genres: Comedy, Sci-Fi
Type: Special, Episodes: 1
Aired: Dec 31, 1990
Studio: Toei Animation
Source: Manga
Rating: PG-13 - Teens 13 or older
Synopsis:
This is the last episode (243), and the 4th movie, “The Treasure of Nanaba Castle” with a wraparound plot of new material, including an older Turbo and the wedding of Tsukutsun and Akane.

(Source: AniDB)