GIR (G Information Retrieval Unit) is the deuteragonist of the Invader Zim series and the secondary antagonist in Invader Zim: Enter the Florpus. He is the insane, hyperactive robotic assistant of Zim and the closest thing the incompetent Irken has to a friend, having been constructed from scrap parts by the Almighty Tallest just before it was handed to Zim, instead of a regular SIR (Standard-issue Information Retrieval) Unit. Despite of being one of the main characters, GIR only played a main role in three episodes: "Walk of Doom", "Invasion of the Idiot Dog Brain" and "GIR Goes Crazy and Stuff", and would have played another major role in the cancelled episode "GIR's Big Day." In every other episode he either played a secondary role, or appeared just as a cameo.