Operation: Z.E.R.O.

Directed by Tom Warburton, Guy Moore

Written by Mo Willems (screenplay and story), Tom Warburton (story), Alison Wilgus (story)

Cast: Ben Diskin as Numbuh 1 and Numbuh 2, Dee Bradley Baker as Numbuh 4, Cree Summer as Numbuh 5, Lauren Tom as Numbuh 3

Released 2006

*Zero Explanation Reveals Origins
A made-for-television movie. The KND must find a way to stop grandfather from ruling the world and turning everyone including adults into senior citizen zombies. Meanwhile Numbuh One finds out his loser dad was the great Numbuh Zero.