The Show that Dare Not Speak Its Name (S07E02)

While Grim steps out to meet an online acquaintance, Billy rummages through Grim’s trunk for amusement. He stumbles upon a mystical talking Rubik's Cube that inadvertently sets free a demon named Pinface, who amusingly sports bowling pins for a crown. Pinface calls forth his minions to seize control of Earth, but they are more enthusiastic about hosting a wild party instead. It turns out Grim has a history with Pinface, having previously dated his sister. In a twist, Billy's father manages to re-solve the cube by rearranging its stickers, imprisoning Pinface and his crew once more.