later the founder of the League of Challenger-Haters. Multi-Woman – A giant robot created by Multi-Man. A second version of her later appeared as a member of the League of Challenger-Haters. Villo – The "world's vilest villain". Volcano Man – A lava monster. He was later a member of the League of Challenge-Haters. Legion of the Weird Malvolio – A criminal who possesses an ancient genie named Ahmed. Mastermind – An Earth criminal who cons Cosmo’s alien master into believing that the Challengers are controlling Cosmo’s mind and forcing him to use his powers for evil purposes. Morlean – A sorcerer who was the first villain the Challengers of the Unknown encountered. Mr. Dimension – A vagrant who stole a dimensional weapon from a timeship from the far future. Mr. Murlin – An alchemist that unleashed a plague that turns ordinary humans into violent zombies. Mr. Tic-Tac-Toe – Dr. Bradford is a criminal who uses traps with a tic-tac-toe motif. Neutro – Starrett is an element-transmuting villain. Olan Tagorian – A criminal scientist whose machine can teleport monsters from other dimensions. Ooze – Killer Stark was accidentally changed into the Ooze during his encounter with the Challengers of the Unknown. Power Man – An energy-absorbing villain. Raymond – A robot that was given to the Challengers of the Unknown as a gift, but had ulterior motives. Roc – A criminal who obtained a mind-over-matter machine. Roney – A criminal who obtained a stone that enables him to control two creatures. Seekeenakee – An incarnate stone "god" whose worshipers want to take over the world. This was actually Red Ryan's transformed appearance. Seth Gross – A wicked magician. Sir Rodford – A criminal who lives in a world within a mirage. Suboku – An alien who tricks the Challengers of the Unknown into doing things that would help him in his invasion. Tartan – An alien ringmaster who once captured the Challengers of the Unknown for his intergalactic circus. Torbert – A criminal who stole a "life liquid" from an ages-old pharaoh. Tukamenon – An ancient mummy that fought the Challengers of Evil on behalf of the Legion of the Weird. Ultivac – A giant computer robot that was built by an ex-Nazi scientist. Volcano Men – Anthropomorphic giants made of fiery lava. Wizard Welles – A criminal that once enlarged Rocky's cranium Zardok – A criminal mystic who gained mind-over-matter