Yuri Lowenthal (39)

Ben Tennyson (voice)

Yeni Alvarez

Dr. Borges (voice)

Ashley Johnson (26)

Gwen Tennyson (voice)

Greg Cipes (30)

Kevin Levin (voice)

Dee Bradley Baker (47)

Humungosaur (voice)

Jeff Bennett (47)

Azmuth (voice) / Major Domo / Hugh (voice) / Magister Labrid / Major General (voice) / Pops Vreedle / Jailer (voice)

Chris Pratt (30)

Cooper (voice)

Powers Boothe (61)

Sunder (voice)

Peter Stormare (56)

King Xarion / King Viktor (voice)

Beth Littleford (41)

Sandra Tennyson (voice)

Scott Menville (39)

Jimmy Jones (voice) / J.T. (voice) / Jimmy / J.T. / Pilot 2 (voice)

Greg Ellis (42)

Prince Gyula / Cyborg #2 (voice) / Dagonet / Reporter Chet Rigby (voice)

J.K. Simmons (55)

Magister Gilhil / Plumber (voice)

Fred Tatasciore (41)

Quince / Robot Guard (voice) / Staradisimus / Forever Knight #3 (voice) / Foreman / Surgeon / Hammer (voice)

Nicholas Guest (58)

Simons / Worker / Guest (voice)

Peter MacNicol (56)

Oliver / Forever Knight #1 (voice)

Matt Levin (38)

Cash (voice)

Tara Strong (37)

Serena / Young Ben Tennyson (voice)

Kevin Michael Richardson (45)

Magister Pyke (voice) / Kwarrel (voice)

Xander Berkeley (54)

Warden Morgg / Trukk (voice)

Brian George (57)

Victor Valadis / Janitor (voice)

Miguel Ferrer (55)

Magister Hulka / Alpha #4 (voice)

Rob Paulsen (54)

Baz-El / Forever Knight #1 / Churl #4 (voice) / Rhomboid Vreedle / Magister Patelliday (voice) / Technician / Rhomboid Vreedle / Engineer #2 (voice)

Charlie Schlatter (43)

Tack / Plumber (voice)

Olivia Hack (26)

Emily (voice)

Jason Marsden (35)

Young Max Tennyson (voice) / Antonio (voice)

Paul Eiding (53)

Max Tennyson / Guard #1 / Guard #2 (voice)

David McCallum (76)

Professor Paradox (voice)

Juliet Landau (45)

Natalie Tennyson / Melinda (voice) / Fritz (voice) / Verdona Tennyson / Waitress (voice)

James Arnold Taylor (40)

Announcer / Fake Vilgax / Fridge (voice) / Plumber Officer / Brannigan / Kolar (voice)