Dr. Slump and Arale-chan Movie 02: "Hoyoyo!" Space Adventure

When local teacher Midori Yamabuki receives an emergency summons to her home planet it turns out to be a trap devised by galactic warlord Dr. Mashirito, and it's up to Dr. Senbei Norimaki and a group of students (including his robot daughter Arale) to venture into space to save her. (Source: ANN)