Codename: Kids Next Door

Ben Diskin

Numbuh 1 / Numbuh 2 (voice)

Lauren Tom

Numbuh 3 (voice)

Dee Bradley Baker

Numbuh 4 (voice)

Cree Summer

Numbuh 5 (voice)

Billy West

Richard Steven Horvitz

John DiMaggio

Big Brother (voice)

Brian Tochi

Greg Cipes

Charlie Schlatter

Eddie Deezen

Jill Talley

Tom Kane

Simon (voice)

Khary Payton

Gregg Berger

Maurice LaMarche

Father (voice)

Mark Hamill

Stickybeard / Sumo Wrestler / Pirate (voice), Stickybeard (voice)

Frank Welker

Professor XXXL (voice), Truck Driver (voice), Bus Driver (voice), Rainbow Monkey Kong (voice)

Rob Paulsen

Mr. Washer / Chili Dog Vendor (voice), (voice), Robin Food (voice)

Jason Harris

Commander (voice), Numbah 274 (voice), (voice), Chad Dickson (voice)

Rachael MacFarlane

Numbuh 362 (voice), (voice)

Josh Peck

Numbuh 50 Million B.C. (voice)

Kevin Michael Richardson

Dr. Lincoln (voice), Ice Cream Man / Ice Cream Beast (voice)

Jeff Bennett

(voice), Mr. Boss (voice), Hoagie Gilligan Sr. (voice), Sydney Beetles (voice), Destructo Dad / Mr. Boss / Mr. Fizz (voice), Numbuh Jebediah (voice)

James Arnold Taylor

King Sandy / Knight #2 / Guard #1 (voice), Eggbert Eggleston (voice)

Keone Young

Kani Sanban (voice)

Daran Norris

(voice), Gooey (voice), Count Spankulot / Gooey / Ice Cream Man #2 (voice), Mr. Physically Fitastic / The Human Text (voice), Count Spankulot / Joe Balooka / Spankenstine Monster (voice), Maitre'd Violinist (voice), RAMON-4 (voice), Joe Balooka (voice), Ed / Guard #1 / Lead Mustache (voice)

Grey DeLisle

Crazy Old Cat Lady / Mega Mom (voice), Laura Limpin (voice), Grace / Lizzie Devine (voice), Julie (voice), Lizzie Divine (voice), Mega Mom / Numbuh 66 (voice), Gramma Stuffum (voice)

Tom Kenny

Knightbrace (voice), Mr. Jelly / Knightbrace (voice), Numbuh 42 / Numbuh Ezekiel (voice), Chester (voice), Hoagie Gilligan IV (voice), Twin Boy / Vicious Dog (voice), Chester / President / Robber #1 (voice), Numbuh 30c (voice), Goof (voice), Fake Delightful Child from Down the Lane (voice), Mr. Wink (voice), (voice), Narrator (voice), Numbuh 30C (voice)

Carlos Alazraqui

The Kid / Pedestrian (voice), Numbuh 2x4 (voice)

Jess Harnell

Tony Clownarelli (voice)

Jason Marsden

Numbuh 80 (voice)

Jennifer Hale

Mrs. Beetles (voice), Dixie / Runt (voice), Mrs. Uno (voice), Numbuh 202 (voice), Numbuh 86 / Nurse Claiborne / Rainbow Monkey Chorus (voice), Stacey (voice), (voice), Mrs. Thompson (voice), Computer (voice), Mrs. Thompson / Robber #3 (voice)

Dave Wittenberg

Nick (voice), Numbuh 74.239 (voice), Ernest "Ernie" / Nick (voice), Wintergreen (voice)

Candi Milo

Grandma Lydia (voice), Edna Jucation (voice), Henrietta Von Marzipan (voice), Madame Margaret (voice), Leona (voice), Leaky Leona / Mrs. Goodwall (voice), Nurse Jumbo (voice), Betty Gilligan (voice), Betty Gilligan / Grandma Lydia (voice), Lasso Lass (voice)

Tara Strong

Mushi Sanban / Numbuh 93 (voice), Pauley Marcus (voice), Sally Sanban (voice), Rainbow Monkey Tribesgirl #3 (voice), Mushi Sanban (voice), Mushi Sanban / Stewie (voice)

Matt Levin

Hooves (voice)

Roger Rose

Little Juan (voice)

Roger L. Jackson

Bonko (voice)

Hynden Walch

Numbuh Rebecca (voice)