Codename: Kids Next Door - Season 2, Episode 10: Operation: C.A.K.E.D.-T.W.O./ Operation: S.P.A.C.E.
Trailer
This season, a mistake from Numbuh 4 shows a cat by an old lady. It appears he has already appeared after padding in Kitty's costume from his feud with Numbuh 3 which is another different stage.