Invader Slacks is an Irken Invader, assigned to the planet Boodie Nen, home of the large nostril people. He wears a terrible disguise, which may be even worse than Zim's. Slacks made his only appearance in the episode Walk for Your Lives, where the Almighty Tallest checked up on him, and ordered that he do a puppet presentation depicting how he plans to conquer his planet. When Slacks questions them, he fails inspection and gets a pummeling as a result. He then promises to do better next time.