Lum the Invader Girl Galactic Teacher CAO-2 Strikes Back! (1981–1986) Online
- Original Title :
- Galactic Teacher CAO-2 Strikes Back!
- Genre :
- TV Episode / Animation / Comedy / Romance / Sci-Fi
- Year :
- 1981–1986
- Directror :
- Osamu Uemura,Mamoru Oshii
- Cast :
- Fumi Hirano,Toshio Furukawa,Yô Inôe
- Writer :
- Kazunori Itô,Rumiko Takahashi
- Type :
- TV Episode
- Time :
- 23min
- Rating :
- 6.8/10
Oyuki meets with Lum, Benten, and Ran to warn them that their old elementary school teacher, CAO-2, has escaped. CAO-2 was a huge, menacing robot teacher shaped like a huge chalkboard eraser. He ran his class with an iron fist, had zero-tolerance for all the pranks that Lum and Benten pulled on him, and often punished them by hurling himself at them. The girls managed to trap him on a stalactite on some remote planet after a chase through space, but now that he's escaped, he's looking for revenge!
| Episode cast overview: | |||
 | Fumi Hirano | - | Lum (voice) |
 | Toshio Furukawa | - | Ataru Moroboshi (voice) |
 | Yô Inôe | - | Ran (voice) (as Yô Inoue) |
 | Noriko Ohara | - | Oyuki (voice) |
| Yûko Mita | - | Benten (voice) |
 | Akira Kamiya | - | Mendou (voice) |
| Michihiro Ikemizu | - | Onsen Mark (voice) |
 | Ichirô Nagai | - | Narrator / CAO-2 (voice) |
| Tomohiro Nishimura | - | (voice) |
| Yûichi Sakuraniwa | - | (voice) |
| Kôzô Shioya | - | (voice) |
The name CAO-2 is derived for the formula for Calcium Oxide. In another reference to calcium, he was trapped on a planet that is made up of calcium.
CAO-2's method of punishment by launching himself at his students hearkens back to a time when Japanese teachers would routinely punish their students by throwing chalkboard erasers at them.