Mercury is an extraterrestrial Robot Master found, reactivated, and used by Dr. Wily. He was first seen in Mega Man V as one of the games 8 Robot Master Stardroids. Like the Bio-Devil series of robots, Mercury is capable of shifting between a solid and liquid state. His main weapon is the Grab Buster, a fist-like attack that snatches powerups like E-Tanks and P-chips (currency) from Mega Man. Mercury is the only Robot Master hitherto to have this ability.