Guest Stars Walton Goggins voices Cecil Stedman Zazie Beetz voices Amber Bennett Gillian Jacobs voices Samantha Eve Wilkins / Atom Eve Jason Mantzoukas voices Rex Sloan / Rex Splode Grey DeLisle Griffin voices Amanda / Monster Girl Chris Diamantopoulos voices Donald Ferguson Zachary Quinto voices Robot Khary Payton voices Black Samson Grey DeLisle Griffin voices Shrinking Rae Kevin Michael Richardson voices Mauler Twins Clancy Brown voices Damien Darkblood Grey DeLisle Griffin voices Olga Khary Payton voices Astronaut #1 Zehra Fazal voices Astronaut #2 Clancy Brown voices Bryant Djimon Hounsou voices Martian Emperor Zehra Fazal voices Young Wife Credit Only Andrew Rannells voices William Clockwell