Guest Stars Christian Slater voices The Narrator Retta voices Ghost's Mom Gary Anthony Williams voices Ghost's Dad Kevin Smith voices Boobie Face Frances Conroy voices Barb Grey DeLisle Griffin voices New Woman Caleb McLaughlin voices Mo-Slo Ben Schwartz voices Kingdom's Dad Kenan Thompson voices Mo-Slo Dad Eugene Mirman voices Denis Xolo Maridueña voices Aqua Agua Justin Roiland voices Papers Asjha Cooper voices Ghost Parker Simmons voices Kingdom Angela Marie Volpe voices Boombox's Mom