Urusei Yatsura

Season 1, Episode 108

Episode Title: Galactic Teacher CAO-2's Revenge

Air Date: 1983-09-21

Overview:

Lum, Ran, Benten, and Oyuki find out that their old teacher, a giant, robot chalkboard eraser named CAO-2, has come to Earth after being trapped on a deserted planet for years. And the former three are not pleased with the news.