Rick teaches Morty how to fly the spaceship, but the lesson is derailed when Rick sells an antimatter weapon to , a cheerful Gromflomite assassin. Horrified by Rick’s casual materialism and lack of ethics, Morty rebels. He thwarts the assassination, accidentally killing Krombopulos Michael in the process, and rescues the intended target: a telepathic, gaseous entity that Morty names "Fart."

"Mortynight Run" is also the foundation for one of the most famous fan theories in the history of the show: .

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The episode is a masterclass in dark humor, clever writing, and voice acting. Justin Roiland's performance as Rick and Morty is, as always, top-notch. The supporting cast, including Sarah Chalke as Summer, and the talented voice actors for the prison inmates, add to the episode's humor and charm.