Bad Kiss

Bad Kiss is the thirty-ninth and final episode of season three (and seventy-ninth episode overall) of Regular Show. It aired on September 3, 2012.

Synopsis
Mordecai and Margaret finally kiss, but Mordecai is left disappointed after it was cut short by his bad breath, and wants to go back in time to re-do it.

Plot
It starts with Mordecai, Rigby, Margaret and Eileen leaving the movies, and driving to the park. When they get there, Mordecai says he forgot his wallet in Margaret's car, so he goes back to find it. A couple seconds later, Margaret shows up, and tries to help him find his wallet. When they get close, they kiss, but Margaret pushes Mordecai away because his breath smelled bad from a chili dog he had earlier.

After being embarrassed, Mordecai grabs Rigby and runs inside the house. He explains that him and Margaret were in the moment, and they kissed - which Rigby didn't believe - but Mordecai says how his breath smelled bad, and how he would be embarrassed forever. Rigby then pulls out a 'time machine', even though Mordecai doesn't believe it works. When they mess with its button, it sends them 15 minutes in the past.

In the past, they see a past Mordecai running to the car, then they press the time machine's button - sending them further into the past. They try to go back many times to keep Mordecai from eating smelly foods, to prevent him from a bad kiss. They eventually end up going back to that morning when Mordecai was in the bathroom. They try to force the past Mordecai to use mouth wash, but when he doesn't believe the present Mordecai and Rigby's story, he takes the time machine from them and goes into the future to kiss Margaret.

Thankfully, Rigby has another time machine, which he says that he got $3 off for a double order, and they go after the past Mordecai. While travelling in time, there are a lot of appearences from previous episodes. When in the process of traveling through time, Mordecai tricks the past Mordecai so that he can keep him from kissing Margaret.

They finally reach the past Mordecai, and Rigby uses one of the time machines to take him to the future. Then present Mordecai and Rigby break the time machines, causing everything that just happened (beteween his first time travel to the machine's destruction) to have cancelled, and time is set to where Mordecai is in Margaret's car. However, Mordecai doesn't want to have a bad kiss and realizing his breath is still bad, he abruptly finds his wallet, stopping Margaret in mid kiss. Then, they get out of the car to join Rigby and Eileen (to have Mordeshakes). The episode ends with them entering the house, leaving Mordecai without a kiss from Margaret.

Characters

 * Mordecai
 * Rigby
 * Margaret
 * Eileen
 * The Mordecai from that Morning (antagonist)

Minor Characters

 * Stag-Man (past cameo)
 * Future Mordecai and Future Rigby (past cameo)
 * Zombies (past cameo)
 * Pops (past cameo)
 * Muscle Man (mentioned)

Trivia

 * In the montage of Mordecai and Rigby running to stop the past Mordecai, moments from five episodes are seen:
 * Mordecai and Rigby camping as the Stag-Man watches from Camping Can Be Cool,
 * Rigby running past the Movie Shack Hut man in a King Kong costume from Ello Gov'nor,
 * Pops serving zombies cotton candy from Grave Sights,
 * Future Mordecai and Future Rigby watching the lipsyncing preformance from Mordecai and the Rigbys (this moment itself is also mentioned by the Past Mordecai earlier in the episode),
 * and Mordecai hiding from the Destroyer of Worlds from Just Set Up the Chairs.
 * The scene showing them running through time resembles the running scene in the Gravity Falls episode, "The Time Traveler's Pig."
 * When Rigby runs to the closet to get the Time Machine, the Mordecai and the Rigbys shirt is seen again.
 * The part where Rigby said they had to destroy the time machine for everything to work is similar to the movie "Back to the Future: Part III" where Doc says they need to destroy their Delorean time machine for everything to be back to normal.
 * While they were inside the theater, one of the posters shows a sequel to Lovebot II called "Lovebot Forever."
 * In the beginning of the episode, Mordecai states that Rigby kept bothering him through the film and that there was a chili dog incident showing that future Mordecai was there.
 * When Mordecai confesses his kiss with Margaret to Rigby, who is shocked, reveals that he owes Muscle Man 'so much money' implying that he had somehow made a bet with Muscle Man on Mordecai making 'his move', it is obvious that Rigby didn't believe he would, whereas Muscle Man bet the opposite, but since using the time machine, which had erased everything, it would seem that the bet between the two is still on.
 * This was the season finale of Season 3.
 * It is possible that they passed through a diffrent campout for multiple reasons: Margaret and Eileen were there, they didn't have a tent built, and it was raining.

Gallery
The gallery for Bad Kiss can be found here.