Guest Stars Isaac C. Singleton, Jr. voices Thanos Logan Miller voices Sam Alexander / Nova Jeff Bennett voices Rhomann Dey Tara Strong voices Nova Prime Trevor Devall voices Fandral Kevin Michael Richardson voices Nova Corpsman 1 Jeff Bennett voices Executioner Jeff Bennett voices Recorded Voice Tara Strong voices Alien Will Friedle voices Nova Corp Guard 1 David Sobolov voices Nova Corp Guard 2 Trevor Devall voices Nova Corpsman 2