Mr. Fizz Occupation Soda Control Board leader Voice Jeff Bennett Homebase N/A Appearances Operation: P.O.P. Operation: M.U.N.C.H.I.E.S. Operation: S.I.X. Operation: Z.E.R.O Operation: S.O.D.A. Cameos Operation: A.F.L.O.A.T. Operation: M.O.V.I.E. Operation: C.A.N.Y.O.N. Operation: U.T.O.P.I.A. Operation: A.W.A.R.D.S. Operation: F.L.U.S.H.

Mr. Fizz is the head of the Soda Control Board, who has raised the legal soda drinking age to thirteen. He enforces this law strongly, putting him in conflict with the Kids Next Door; ironically, he himself loves soda. Mr. Fizz speaks with a Spanish accent and wears a fancy white suit and purple glasses. He uses various weapons based on soda bottles and barrels, but he can't stand the sound of children. His main enemy is Numbuh 2.

Mr Fizz appears in Operation: P.O.P., Operation: S.I.X., and the Gameboy Advance game Operation: S.O.D.A., of which he is the main villain.