On screen
Cast
45 credited performers
Yuri Lowenthal
Ben Tennyson (voice)
Ashley Johnson
Gwen Tennyson (voice)
Greg Cipes
Kevin Levin (voice)
Dee Bradley Baker
Jetray / Humungousaur / Big Chill (voice)
Paul Eiding
Max / Alien Serf (voice)
Jeff Bennett
Magister / Forever Knight #1 (voice)
Richard McGonagle
Character not listed
Kevin Michael Richardson
HighBreed / DNAlien (voice)
Vyvan Pham
Julie / Mother (voice)
John DiMaggio
Rath (voice)
Wil Wheaton
Mike Morningstar (voice)
Zeno Robinson
Alan Albright (voice)
David McCallum
Paradox (voice)
Juliet Landau
Helen (voice)
Khary Payton
Manny (voice)
Robert David Hall
Forever Knight #3 / Counterman (voice)
Adam Wylie
Pierce (voice)
Greg Ellis
Forever Knight #1 / Forever Knight #2 / Jailer (voice)
Corey Padnos
Cooper (voice)
James Remar
Vilgax (voice)
Tim Curry
Dr. Chadwick / Knight #2 (voice)
Vicki Lewis
Serena (voice)
Kevin Conroy
Bellicus / Warrior 2 (voice)
Scott Menville
JT (voice)
Ioan Gruffudd
Devin Levin / Robot Guard (voice)
Alexander Polinsky
Argit (voice)
Kamali Minter
Trina / Zombie Girls (voice)
Kim Mai Guest
Lucy / Zombie Girls (voice)
Diane Delano
Edna / DNAlien #1 (voice)
Will Friedle
Ken / Shem (voice)
Rob Paulsen
Alien Pilot / Cotton Candy Vendor / Patrolman (voice)
George Newbern
Frank (voice)
Barbara Bain
Verdona (voice)
Matt Levin
Cash (voice)
Michael York
Patrick (voice)
Hakeem Kae-Kazim
Connor (voice)
Clancy Brown
Dragon / Pilot (voice)
Tara Strong
Attea (voice)
James Arnold Taylor
Raff / Attendant 1 (voice)
J.K. Simmons
Magister Gilhil (voice)
Don McManus
Carl Tennyson (voice)
Beth Littleford
Sandra Tennyson (voice)
Wallace Langham
Tyler / DNAlien #2 (voice)
Diedrich Bader
Simian / Lu (voice)
Dwight Schultz
Null Guardian / D'Void (Dr. Animo) (voice)