It's Christmas. Rick shrinks Morty, injecting him into a homeless man to save Anatomy Park. Jerry tries to have a Christmas free of electronic devices, but regrets his decision when his parents introduce him to their new friend.
After Rick gives Morty a Love-potion for prom, things quickly spiral out of control when the Serum splices with the Flu - causing it to spread. Rick and Morty scramble to cure the crisis, making matters worse in the process.