Guest Stars Tom Scharpling voices Greg Erica Luttrell voices Sapphire Michaela Dietz voices Amethyst Guards Lisa Hannigan voices Blue Diamond Patti LuPone voices Yellow Diamond Deedee Magno Hall voices Blue Pearl Christine Pedi voices Holly Blue Agate Kimberly Brooks voices Carnellian Kimberly Brooks voices Skinny Deedee Magno Hall voices Yellow Pearl