Guest Stars Walton Goggins voices Cecil Stedman Gillian Jacobs voices Samantha Eve Wilkins / Atom Eve Jason Mantzoukas voices Rex Sloan / Rex Splode Grey DeLisle Griffin voices Amanda / Monster Girl Zachary Quinto voices Robot Melise voices Kate Cha / Dupli-Kate Ross Marquand voices The Immortal Ross Marquand voices Rudolph "Rudy" Conners Seth Rogen voices Allen the Alien Jay Pharoah voices Zandale Randolph / Bulletproof Sterling K. Brown voices Angstrom Levy Clancy Brown voices General Kregg Calista Flockhart voices April Howsam Ross Marquand voices Omnipotus Ella Purnell voices Jane Melise voices Zombie #3 Jason Mantzoukas voices Zombie #2 Grey DeLisle Griffin voices Dinosaur #3 Grey DeLisle Griffin voices GDA Trooper Josh Keaton voices Agent Spider Josh Keaton voices Taylor Zachary Quinto voices Zombie #4 Zachary Quinto voices Dinosaur #1 Chloe Bennet voices Riley Jay Pharoah voices Dinosaur #2 Jay Pharoah voices Zombie #1 Clancy Brown voices Ka-Hor Eric Bauza voices Alien Guard Eric Bauza voices Neighbor Eric Bauza voices Viltrumite Camden Coley voices Angstrom Levy Jr. Co Starring Nyima Funk voices Additional Voices Ami Shukla voices Additional Voices Robert Kesselman voices Additional Voices Dan Navarro voices Additional Voices