Tara Strong

Ben Tennyson (voice)

Meagan Moore

Gwen Tennyson (voice)

Paul Eiding

Grandpa Max (voice)

Dee Bradley Baker

Stinkfly / Wildmutt (voice)

Steve Blum

Ghostfreak / Heatblast / Vilgax (voice)

Richard McGonagle

Four Arms (voice)

Jim Ward

Diamondhead / XLR8 (voice)

Richard Steven Horvitz

Grey Matter (voice)

Fred Tatasciore

Ripjaws / Krakken (voice)

Robert Patrick

Phil (voice)

Charlie Schlatter

Kevin Levin (voice)

Michael Reisz

Kevin Levin (voice)

Nolan North

Teen Attendant / Henchman (voice)

Rosalind Chao

Councilwoman Liang (voice)

Cree Summer

Frightwig (voice)

Miriam Flynn

Aunt Vera (voice)

Jeff Doucette

Thumbskull (voice)

John Kassir

Zombozo (voice)

Larry Cedar

Howell (voice)

Nicholas Guest

Clancy (voice)

Robin Atkin Downes

Jonah (voice)

Billy West

Kraab (voice)

Dwight Schultz

Dr. Animo (voice)

Walker Edmiston

Marty (voice)

Dave Fennoy

Radio Newscaster / Doctor (voice)

Mikey Kelley

Gang #2 / Attendant / Helicopter Pilot (voice)

Jennifer Hale

Joey (Rojo) (voice)

Nancy Linari

Tour Guide / Reporter / Screaming Woman (voice)

Khary Payton

Hex (voice)

Robert Picardo

Leader Alien (voice)

James C. Mathis III

Enforcer Alien (voice)

Bill Ratner

The Seer (voice)

Jack Angel

Technorg (voice)

Richard Doyle

Mr. Jingles (voice)

Armin Shimerman

Slix (voice)

Kari Wahlgren

Charmcaster (voice)

Greg Ellis

Synaptak (voice)

John DiMaggio

Vulkanus (voice)

Adam Wylie

JT (voice)

Tom Kane

Donovan (voice)

Vanessa Marshall

Tini (voice)

Patricia Lentz

Mildred / Gypsy (voice)

Kim Mai Guest

Andy (voice)

Jennifer Malenke

Missy (voice)

Grey DeLisle

Xylene (voice)

Kath Soucie

Little Boy / Tiffany (voice)

Miguel Nájera

Wes (voice)

Bettina Bush

Kai (voice)

Keone Young

Ishyama (voice)

Clancy Brown

Kenko (voice)

Dave Wittenberg

Harold / Escape Artist / Emcee (voice)

Josh Keaton

Dean (voice)

John Cygan

Abel North (Kangaroo Commando) / Kane North (voice)

Rob Pinkston

Todd (voice)

Jess Harnell

Band Member #1 / Announcer (voice)

Marc Thompson

Vance (voice)

Michael Dorn

Vicktor (voice)

Richard Green

Benmummy (voice)

Michael Gough

Lt. Steel (voice)