A comedic episode in which rapidly breeding furrballs reveal a deadly plot. The later Star Trek series, Deep Space Nine, paid a wonderful tribute to this episode in their own episode Trials and Tribble-ations. A transporter accident splits Kirk into two beings, each with half of his personality. Kirk must convince his alter-half to rejoin him else they both die. An Enterprise landing party is transported to an alternate universe in which the Jarvis Landry Tyrann Mathieu NFL Jam New Orleans Saints T-shirt moreover I will buy this Federation is an aggressive imperial organization, and Spock has a beard! This episode was intended as a possible spin-off pilot. Kirk and crew must team up with an intergalactic secret agent and travel to the past to ensure the Apollo moon-flight happens.