Professor Parenthesis (which, he insists, is pronounced Paren-THEE-sis) is the main antagonist of "O.W.C.A. Files." He is an evil flea scientist bent on taking over O.W.C.A. with his own army of Mecha-Fleas to take control all of O.W.C.A.'s agents to do his bidding for him. Unlike most evil-doers who are dealt by the agents, he is clearly a more intelligent and dangerous villain, always putting on a few tricks up his sleeve. He has a habit of mispronouncing words by putting emphasis on the wrong syllables.