Guest Stars Walton Goggins voices Cecil Stedman Zazie Beetz voices Amber Bennett Gillian Jacobs voices Samantha Eve Wilkins / Atom Eve Andrew Rannells voices William Clockwell Grey DeLisle Griffin voices Amanda / Monster Girl Khary Payton voices Black Samson Zachary Quinto voices Robot Kevin Michael Richardson voices Mauler Twins Mark Hamill voices Art Rosenbaum Fred Tatasciore voices Adam Jonathan Groff voices Rick Ezra Miller voices DA Sinclair Max Burkholder voices Matt Fred Tatasciore voices Professor Khary Payton voices Kyle Justin Roiland voices Doug Cheston