Codename: Kids Next Door: Operation Z.E.R.O.

Jason Harris

Chad Dickson (voice)

Grey DeLisle

Crazy Old Cat Lady/Gramma Stuffum (voice)

Jeff Bennett

Mr. Boss / Mr. Fizz / Benedict Wigglestein (voice)

Jennifer Hale

Fanny 'Numbuh 86' Fulbright / Computer (voice)

Mark Hamill

Stickybeard (voice)

Tom Kenny

Knightbrace / Mr. Wink (voice)

Maurice LaMarche

Father (voice)

Matt Levin

Patton 'Numbuh 60' Drilovsky (voice)

Frank Welker

Monty Uno (voice)

Neil Ross

Grandfather (voice)