The evil and scary robotic version of Numbuh 1 (in Operation: R.A.D.I.A.T.I.O.N) is similar to fire demonic version of Numbuh 3 (in Operation: H.O.T.S.T.U.F.F). In this episode, Numbuh 1 becomes a temporarily villain.
Credit to RoboXD, Mr. Warburton, Warner Bros. Discovery, and Cartoon Network.
