Yuri Lowenthal
— Ben Tennyson /Feedback /Sock Vendor (voice)
Ashley Johnson
— Gwen Tennyson (voice)
Greg Cipes
— Kevin Levin (voice)
Dee Bradley Baker
— Heatblast /Eatle /Humungousaur /Jury Rigg /Psyphon /Lodestar /Spidermonkey / NRG /Water Hazard /Psyphon (voice)
Peter Renaday
— Sir George (voice)
Vyvan Pham
— Julie Yamamoto /Ship (voice)
James Remar
— Vilgax (voice)
John DiMaggio
— Diagon/ Four Arms /Bubble Helmet /Zombozo / Armodrillo/ Tentacle Vendor (voice)
Scott Menville
— Jimmy Jones (voice)
Jeff Bennett
— Azmuth (voice)
Tara Strong
— Young Ben Tennyson /Pakmar / Alien Mother /Little Girl (voice)
Bumper Robinson
— Rook Blonko /Bloxx /Terraspin /Smoothie Vendor (voice)
Paul Eiding
— Max Tennyson /Zed /Liam (voice)
David A. Kaye
— Cannonbolt /Shocksquatch /Khyber /Cyanic Alien (voice)
Corey Burton
— Malware /Mr. Baumann (voice)
Rob Paulsen
— Magister Patelliday /Tummyhead /Alien Driver (voice)