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"K.I.L.I.T. Radio" is the twenty-third episode in Season 4 (and one-hundred-second episode overall) of Regular Show. It first aired on April 22, 2013.
Muscle Man writes a song for Starla and tries to get it on the radio, but must work past intense security to play it.
Mordecai and Rigby are cleaning the cart while Muscle Man writes a song to Starla. Muscle Man continuously asks the two words and what they rhyme with until Mordecai becomes sick of it: he asks him why he is asking the questions and he says it's because he's writing a song for Starla due to it being their anniversary for the first time they 'made out' and he wants K.I.L.I.T. Radio to play it. Mordecai and Rigby don't think it will work since they haven't played song requests for years. Muscle Man though says it will work. They head into the house and Muscle Man calls K.I.L.I.T. Radio. A voice tells him to press 0 to talk to an employee. Muscle Man does so, but it doesn't work so Muscle Man, Mordecai and Rigby go down to the Radio Station personally. They go down and Muscle Man presses a button, and the voice asks if he has an appointment. He says no, so the voice doesn't let him in. Just then, a man known as Donny G arrives and unloads some of his equipment. Muscle Man goes over to him and asks if he can play his song for Starla. Donny breaks out in a sweat, but agrees. Mordecai, Rigby and Muscle Man then get into Muscle Man's car and leave. Muscle Man looks at his side view mirror and sees Donny throw his tape into the bin. Muscle Man runs up to him and yells at him. Donny apologizes and says he will reveal why he threw it out - but not at the station. Instead, he decides to talk where it's safe.
Later, the four go to a diner and Donny tells them why he discarded the tape. A few years ago, K.I.L.I.T. Radio had groups of DJs announcing until a group of people came into the building and replaced the DJs with a machine called the K.I.L.I.T. DJ 3000. The DJs still worked there though but were unable to put in song requests. Soon, someone did put a song request in and a bunch of tapes choked him to death. All of the DJs except Donny escaped and Donny was held hostage, becoming a janitor at the building. Ever since that day, there haven't been any requests. Muscle Man then says that the radio should be controlled for the people, by the people and will help him turn the building back to normal.
That night, Donny arrives back at K.I.L.I.T. Radio with Muscle Man, Rigby and Mordecai dressed as janitors. Some cameras scan them and find that none of them are a threat. They head inside and head down to the basement and gather supplies. Rigby grabs a long chord and it accidentally knocks over a shelf, alerting the cameras. They see what everyone is holding and they attack them with tapes. They burst out of the basement and run to the elevator. The tapes continue attacking until Muscle Man kicks them off of the elevator. They soon come to the recording station of the building. Donny and Mordecai lift Muscle Man out of the elevator so he can pry the elevator doors open and escape. The elevator's ropes snap and Muscle Man grabs them and lifts them up. They rush in and Donny sets up the things they need while Muscle Man, Mordecai and Rigby fight off some mechanical machines. Then, a disk is shot out from the K.I.L.I.T. DJ 3000, punching a hole in Donny. Muscle Man destroys the machines and runs over to Donny, who is given the tape by Muscle Man. He then tells the three to just keep running, no matter what they hear. They do so and Donny places the tape into the K.I.L.I.T. DJ 3000. The machine is set to self-destruct while Donny gives the shout out to Starla, who is listening to the radio station at the mall. Muscle Man's song is then played while Mordecai, Rigby and Muscle Man run from the explosion. It ends just when the building burns down and Starla arrives at the building. She thinks Muscle Man's song was amazing and thanks him for remembering their anniversary from the first time they made out. The two kiss while Mordecai, Rigby and Donny (who survived the explosion, has a hole in his belly and is on fire) walk away and think the way they escaped the fireball was like it was in a movie.
- Earlier in the episode, Muscle Man was originally going to say "You're the pickles on my burger." instead of "You're the cheese upon my burger."
- It is revealed that Muscle Man can sing quite well in this episode. On the other hand, Pops happens to not be so good at singing as shown in "Karaoke Video" when he sang Footloose. Which is weird because Muscle Man and Pops share a voice actor.
- Sam Marlin sang a slightly extended version of "Oh Starla" during the Regular Show panel at Comic-Con 2013.
- Donny G's tale of the K.I.L.I.T. supercomputer's evolution is a reference to the movie Terminator 2: Judgment Day, wherein the T-800 Terminator recalls how the Skynet computer, once activated, increased in computing power "...at a geometric rate" untl it gained self-awareness (also at 2:14 on a day in August, although K.I.L.I.T. was "born" at 2:14 P.M. EST and SkyNet was "born" at 2:14 A.M. EST).
- The record going through Donny G's stomach was changed to it getting stuck in his stomach.
- The closing scene replaces Donny G's hole in his stomach with his regular clothes.