A mutant from The Hills Have Eyes. He was one of the two mutants under Big Mama's care. He has large eyes, blue skin, and a skeletal face. He, along with Venus, appear to be the two weakest mutants because they were seen playing with toys instead of attacking Doug while he was looking for Catherine.
- He is named after a mutant in the original version of The Hills Have Eyes. The original Mercury appeared to be mentally challenged because he never notices what goes on around him even though he has memorized the entire terrain of the Hill People's village.