Urusei Yatsura S01 E108 Galactic Teacher CAO-2's Revenge

"Grab her horns and she might just become your darling!"

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.