Anti-Head Alien

From Walkypedia!

The opposite number of Head Alien created by the Dup-O-Matic. Unlike the regular version, Anti-Head Alien is an amiable fellow, who is just trying to be helpful. During the final confrontation with the Martians, Head Alien's soul possessed and took control of Anti-Head Alien using The Cheese. It is unclear whether any part of Anti-Head Alien remained after this possession, but it would seem to be a moot point; after The Cheese was released from Head Alien's control, Sal impaled him with a Martian fork, killing him.