Rick and Morty vs. Cthulhu #1

Scanning the Smith house for signs of The Sucrose Squad, Rick instead finds an infestation of "Mythos Molecules" from the Lovecraft Dimension and assembles the family for a mission to slay Cthulhu, the dimension's elder god. Armed with a blunderbuss-styled weapon that sucks-in Lovecraftian horrors and grinds them to "Cthulian Corpse Dust", he dispatches the alien "Color Out of Space" and, with Summer's help, the ghoulish Wilbur Whateley. After sending Beth and Jerry home, and obliterating The Dunwich Horror, Rick, Morty, and Summer move on to Innsmouth... where things go sideways.

Plot details indexed by the Grand Comics Database (CC BY-SA).