Dib Membrane is the only son of Professor Membrane and brother of Gaz Membrane. He is known for his large head. Dib always wanted to solve paranormal mysteries. Once he heard of an alien invasion, he warned his sister and dad but they wouldn't believe him. He met Zim and noticed that Zim is an alien due to his green skin and that Zim has no nose. Somehow, the other kids at Skool call Dib crazy.