Big Billy is a zombie gorilla that wears nothing but a red hat that covers a little part of his brain and his right leg is all bone no foot. He was also Meatwad's pet because he was sick of losing his hamsters. Also he communicates by moving his hands. In the episode Reedickyoulus (episode) Big Billy and the other zombie animals came back from the dead because of Carl's radioactive waste. He died because Master Shake killed him by putting him in the microwave like Terrance. Mr. Sparkles death was an acident. Big Billy and the other zombie animals turned shake into a zombie by sleeping with him.