Dibert "Dib" Membrane (voiced by Andy Berman) is a young eccentric paranormal investigator who spends his time studying the supernatural and paranormal, as well as thwarting Zim in his schemes to take over the world. Dib is generally mocked, bullied and hated by his classmates because they see him as annoying and crazy. Even though Dib’s classmates tend to bully him, he is reluctantly determined to defend and save them from Zim’s evil schemes anyway. Zim and Dib often fight and hate each other, as Dib, knowing Zim is an alien bent on destroying the Earth, is determined to protect planet Earth and humankind. While they are often portrayed as mortal enemies, Dib and Zim have at times been forced to work together as reluctant teammates. Despite their feud, an unfinished episode of the series titled "Mopiness of Doom" revealed that Dib lost interest in Zim and the paranormal while Zim gave up on destroying Earth and mankind, though he later came back when Dib changed his mind and decided to hunt Zim.