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 Chris Diamantopoulos voices Donald Ferguson Grey DeLisle Griffin voices Amanda / Monster Girl Khary Payton voices Black Samson Zachary Quinto voices Robot Grey DeLisle Griffin voices Shrinking Rae Kevin Michael Richardson voices Mauler Twins Grey DeLisle Griffin voices Olga Clancy Brown voices Damien Darkblood Khary Payton voices Astronaut #1 Zehra Fazal voices Astronaut #2 Djimon Hounsou voices Martian Emperor Clancy Brown voices Bryant Zehra Fazal voices Young Wife Credit Only Andrew Rannells voices William Clockwell