He was seen with Spoo in "Parent Teacher Night", implying that they're father and son. In the same episode, he claimed that his own father was like Membrane (presumably meaning that he was never around, not because he was a brilliant scientist), and he was also one of Ms. Bitters' former students. In spite of all this, he maintains a positive outlook on life and is a very kind person.
He was going to have a major role in the episode "Simon Says Doom", but since the episode was never finished, he has only made cameo appearances. In one episode, he moonlights as an actor in TV commercials.
"Simon Says Doom"'s closing scene revealed that while Mr. Elliot is very sweet and may initially seem like a pushover, he can get firm from time to time (but not too harsh; his command for Dib to take care of the mess is delivered in a very paternal tone).
- "The Nightmare Begins" (debut)
- "Parent Teacher Night"
- "GIR Goes Crazy and Stuff"
- "Tak: The Hideous New Girl"
- "Gaz, Taster of Pork"
- "Simon Says Doom" (unaired)
|Characters of Invader Zim|
|Zim • GIR • Dib Membrane • Gaz Membrane|
|Almighty Tallest Purple • Almighty Tallest Red • Ms. Bitters • Professor Membrane|
|Invader Skoodge • Keef • Minimoose • Tak • President Man • Roboparents • Lard Nar • Skool Principal|
|Adult Dib • Old Kid • Hobo • Alan • Meef • Skoolchildren|
|Mortos der Soulstealer • Sergeant Slab Rankle • Sergeant Hobo 678 • Shadow Hog • Chickenfoot • Sizz-Lorr • Gashloog • Willy • Iggins • Walton Chunky • Pigboy|
|Louie • Digestor • Almighty Tallest Spork • Almighty Tallest Miyuki • Bloody GIR • Cthulu • Cybernetic Kitten • Dinky • Little Timmy|