Codename: Kids Next Door Extreme

Codename: Kids Next Door Extreme is to take place where Operation: I.N.T.E.R.V.I.E.W.S. (It's Now The Extra Really Very Interesting End Wrap-Up Story) had left off.

Voice Cast Members

 * Ben Diskin as Numbuh 1/13 Year Old Nigel, Numbuh 2/14 Year Old Hoagie and the Delightful Children from Down the Lane (voices)
 * Lauren Tom as Numbuh 3/15 Year Old Kuki, Genki (Numbuh 3 and Mushi's mother and Kani's wife) and the Delightful Children from Down the Lane (voices)
 * Dee Bradley Baker as Numbuh 4/16 Year Old Wally, Tommy/Numbuh 988,989, Joey Beetles/Numbuh 898,899, the Toilenator and the Delightful Children from Down the Lane (voices)
 * Cree Summer Francks as Numbuh 5/17 Year Old Abby, Abby, Cree Lincoln and the Delightful Children from Down the Lane (voices)
 * Jennifer Hale as Numbuh 86, Nancy Uno, Mona Beetles and the Treehouse Computer Screen (voices)
 * Rachel MacFarlane as Numbuh 362 (voice)
 * Maurice LaMarche as Father (voice)
 * Tom Kenny as Mr. Wink, the Common Cold, Chester, Knightbrace and the Boy Twin (voices)
 * Grey DeLisle Griffin as Gramma Stuffum, Lizzie Devine and the Crazy Old Cat Lady (voices)
 * Candi Milo as Betty Gilligan and Grandma Lydia (voices)
 * Tara Charendoff as Mushi/Numbuh 469,470, Numbuh 10, Katie and the Girl Twin (voices)
 * Daran Norris as Count Spankulot and Big Brother (voices)
 * Jeff Bennett as Sid Beetles, Principal Sauerbraten and Mr. Fib (voices)
 * Kevin Michael Richardson as Dr. Lincoln (voice)
 * Keone Young as Kani (Numbuh 3 and Mushi's father and Genki's husband) (voice)
 * Frank Welker as Monty Uno and Professor Triple Extra Large (voices)
 * Janice Kawaye as Numbuh 83 and Numbuh 84 (voices)
 * Matt Levin as Numbuh 60 (voice)
 * Jason Harris as Numbuh 274 (voice)
 * Khary Payton as Maurice (voice)
 * Bill Farmer as Principal Smelling (voice, replacing the late Joe Alaskey respectively)
 * Mark Hamil as Stickybeard (voice)
 * Jim Cummings as Vin Moosk (voice)
 * Scott Menville as Numbuh 85 (voice)
 * James Arnold Taylor as King Sandy (voice)
 * Amber Hood as Jessica/Numbuh 623,624 (voice)
 * Billy West as Numbuh 13 (voice)
 * Charlie Schattler as Numbum 20,000 (voice)
 * Greg Cipes as Numbuh 679,670 (voice)
 * Ogie Banks as Numbuh 453,454 (voice)
 * Jason Marsden as Numbuh 80 (voice)
 * Rob Paulsen as Numbuh 735,736 (voice)
 * Richard Horvitz as Numbuh 864,865 (voice)
 * Jess Harnell as Chef Pierre (voice)
 * Chris Edgerly as Numbuh 727,728 (voice)
 * Phil LaMar as Numbuh 328,329 (voice)

New Voice Cast Members

 * Danny Cooksey as Numbuh 325,326 (voice)
 * Kath Soucie as Numbuh 238,239 (voice)
 * Lane Toran as Numbuh 385,695 (voice)
 * Francesca Smith as Numbuh 758,759 (voice)
 * Justin Shenkarow as Numbuh 463,464 (voice)
 * Emily Hahn as Numbuh 689,690 (voice)
 * Alexander Gould as Numbuh 145,146 (voice)

Seasons

 * Season 1
 * Season 2
 * Season 3
 * Season 4
 * Season 5
 * Season 6
 * Season 7
 * Season 8
 * Season 9