Full Synopsis
Alien parasites plant fake memories in the minds of Rick, Morty, Beth, Jerry and Summer and pretend they are friends and family members. Every time the family reminisces about the past, the aliens reproduce. The family can’t distinguish real people from aliens, so eventually they can’t even trust each other. To prevent further spread, Rick locks down the house. At first, the only alien present is the fake “Uncle Steve”; they are soon joined by other aliens including Cousin Nicky, Sleepy Gary (who poses as Beth’s husband and Jerry’s lover), the family butler Mr. Beauregard, Frankenstein’s Monster, a talking pencil named Pencilvester, Tinkles the Fairy Lamb, etc. Mr. Poopybutthole is an unusual yellow creature who did not appear in any previous episode but appears to be a longtime friend. Eventually, Morty discovers that the parasites can only create positive memories, allowing the Smith family to confirm one another’s existence and kill all the aliens. Beth mistakes Mr. Poopybutthole for a parasite and shoots him.
