Invader Nox is a scientist turned invader. The 35 shcamillion error in his PAK makes him competitive trying to out do everyone. His SIR Unit M.A.I.R.'s extensive modifications is always causin malfunctions which may be why he cannot conquer his currently assigned planet.
Operation Impending Doom 1
Not much is known about his role only that his assignment was withdrawn due to ZIM nearly destroying Irk.
Post Operation Impending Doom 1
After DOOM 1, there was no need for invaders he was forced to work at a small cafe on a snack planet. Though he wasn't mistreated at by the cafe workers, and his boss was nice by Irken standards, Invader blood was marching through his veins.
OPERATION IMPENDING DOOM 2
When OPERATION IMPENDING DOOM 2 came around Imperial gaurds came and took Nox to the great assigning, there he was assigned to planet Volcanus, home of the humanold Volcani.
Volcanus
Invader Nox's first assignment was Volcanus. He disguised himself as a Volcani, (wore yellow paint, fake cybernetic eye, arm, and leg peice, fake hair, and a blue eye contact.) M.A.I.R. was disguised as a lava pup. His base was built in a stabalized volcano. Volcanus was evenrually conquered when Nox created an Insta-Freeze missile, loaded in his Spittle Runner, and froze the surface of the planet. Since the Volcani could've not survive the cold the were forced to bow to the almighty Irken a Empire.
PLANET GREASE
On Grease, Invader Mod usually remained in his orbital laboratory disguised as foodtopia "heaven". Nox disguised himself as a 'Diety' by covering himself in yellow hot grease, and tricking its inhabitants intoslavery.