Dib Membrane
Iz dib
Professor Membrane(father), Gaz(sister)
Andy Berman
First Appearance

Dib Membrane is a main character on the Nickelodeon show Invader Zim. He is a thirteen year old boy, is one of the few who sees through Zim's obvious disguise and tries to save the world from him; he will do anything to save the earth and prove that Zim is an alien, being completely oblivious of the fact that Zim is an outcast, was exiled from his own planet and his entire mission to conquer earth is fake.

A running gag in the series is that in most of his attempts to expose Zim's secret, he almost never wins, and ends up being the scapegoat for punishment after his plans fail. Even on a good day, he usually gets a Pyrrhic victory,

There's a running gag along the series of Dib being mocked about his "big" head. This started on the "Door to Door" episode, and was said for first time by GIR. Dib is part of a secret organization called "The Swollen Eyeball Network". His nickname inside the organization is "Agent Moth Man".



Prof. Membrane

He is the son of the most intelligent man on earth, Professor Membrane. Dib shares his discoveries with his father on several occasions; however, no matter how good the evidence is, his father never believes him nor supports him.

His younger sister's name is Gaz. Her relationship with Dib is quite bad, showing from little to no care for him; since he constantly interferes with her life.


He is extremely smart, and becomes easily frustrated when everybody calls him crazy. He is very obsessive in the matters related with Zim, and has a fascination for the paranormal and the cryptology.