Ben Tennyson (voice)
Gwen Tennyson (voice)
Kevin Levin (voice)
Humungosaur (voice)
Aggregor (voice) / Vulkanus / Rath (voice)
Azmuth (voice) / Pops Vreedle / Jailer (voice)
Julie Yamamoto / Computer Voice (voice) / Julie Yamamoto (voice)
Max Tennyson / Guard #1 / Guard #2 (voice)
Sir George (voice) / Old George (voice)
Jimmy Jones (voice) / J.T. (voice)
Natalie Tennyson / Melinda (voice) / Verdona Tennyson / Waitress (voice)
Vilgax (voice)
Argit (voice)
Charmcaster (voice)
Quince / Robot Guard (voice) / Staradisimus / Forever Knight #3 (voice)
Rhomboid Vreedle / Magister Patelliday (voice) / Technician / Rhomboid Vreedle / Engineer #2 (voice)
Professor Paradox (voice)
Dr. Animo / Teacher #2 (voice) / Sheriff / Dr. Animo (voice)
Mike Morningstar / Darkstar (voice)
Winston / Esoterica / Additional Voices (voice)
Cooper (voice)
Prince Gyula / Cyborg #2 (voice) / Dagonet / Reporter Chet Rigby (voice)
Oliver / Forever Knight #1 (voice)
Kwarrel (voice) / Magister Pyke (voice)
