Guest Stars Walton Goggins voices Cecil Stedman Zazie Beetz voices Amber Bennett Andrew Rannells voices William Clockwell Jason Mantzoukas voices Rex Sloan / Rex Splode Grey DeLisle Griffin voices Amanda / Monster Girl Melise voices Kate Cha / Dupli-Kate Ross Marquand voices Rudolph "Rudy" Conners Dan Navarro voices Additional Voices Robert Kesselman voices Additional Voices Ami Shukla voices Additional Voices Nyima Funk voices Additional Voices Seth Rogen voices Allen the Alien Ben Schwartz voices Shapesmith Grey DeLisle Griffin voices Thula Rob Delaney voices Nuolzot/Séance Dog Peter Cullen voices Thaedus Lea Thompson voices Carol Fred Tatasciore voices Data Twin #2 Fred Tatasciore voices Ticker Seller Fred Tatasciore voices Marvin Melise voices Lucinda Grey DeLisle Griffin voices Woman Tatiana Maslany voices Telia Daveed Diggs voices Theo Daveed Diggs voices Council Member #2 Jay Pharoah voices Council Member #1 Jay Pharoah voices Cute Guy Jay Pharoah voices Data Twin #1 Paul F. Tompkins voices Narrator