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This episode received an Emmy nomination for Short-Format Animated Program.
Mordecai and Rigby must perform at an Open Mic Night at the coffee shop after Mordecai lies to Margaret about him and Rigby forming a band.
Mordecai and Rigby order a box of “fake” band t-shirts after the night pictured, which leads to Mordecai convincing Margaret that the band is real the next day at the coffee shop. The band is called Mordecai and the Rigbys. The band name was going to be Mustache Cash Stash but Rigby changed it at the last minute before ordering the shirts. Margaret then hands them a flier for the open mic night at the Coffee Shop where she works and tells the two they should play at it because she saw the shirt. Wanting to impress Margaret and so she doesn't think they have a "stupid fake band", Mordecai tells her that he and Rigby will play at the show.
Realizing that they don’t know how to play, Mordecai and Rigby go to Pops for help, only to learn that he and everyone else from the park are also going to be attending the open-mic night. Pops gives Mordecai and Rigby three records for his Victor talking machine to help them learn to play in time, but they are extremely outdated, and less than helpful. To speed things up, Mordecai and Rigby try playing all three records at once. But when a drink is spilled, however, this causes the record players to react with one another, resulting in Mordecai and Rigby's future selves who appear (where it turns out they are both very successful musicians).
The future selves teach Mordecai and Rigby the lyrics, the moves, and the looks, but never how to play. Future Mordecai and Future Rigby hand them both guitar picks and tell them that they will be great, though. Sure enough, when they get on stage, they perform amazingly, impressing even Benson. Halfway through the performance, though, Mordecai realizes that their equipment is not plugged in, and their “performance” is being played from a tape. He stops Rigby and the performance, and gives a talk about how lip-syncing is “not cool”. The future versions told how lip syncing made them rich and famous, but Mordecai angrily told them that lip-syncing is lame and how he and Rigby don't want to be liars in the future and then rips his shirt in two.
That action causes the future versions of themselves, to disappear forever into oblivion. Unfortunately, though Margaret is still impressed with Mordecai, she asks if he has, “met her new boyfriend" Angel, one of the earlier performers who mostly sings instead of talking. After this, Rigby tells Mordecai he "should have kept lip-syncing."
- This episode has a unique credits theme, playing an instrumental version of "Party Tonight" instead of the typical credits theme.
- A sequel to this episode was released in Season Five, titled "Return of Mordecai and the Rigbys".
- Benson's line "Holy crap!" was changed to "Holy crud!" outside of the USA.
- Rigby is seen wearing his band T shirt when he goes to find Pops, but when Pops says: "Everyone knows about it, we will all be there!", he is missing his shirt.
- Muscle Man is not listed in the credits, despite having a speaking role in the episode.