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Mordecai and Rigby are shown working at a park as groundskeepers with their friends, being late to work, and getting in trouble by their boss like usual.

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A spaceship falls from the sky, crashing into the park, revealing a wounded version of Rigby from the future, asking Mordecai, Rigby, and their friends to help stop Future Mordecai from erasing all of time by destroying a device their dodgeball coach, Randall Ross, created 10 years ago before Future Rigby died on the spot.

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Mordecai and Rigby are suspicious about it, talking over it with everyone, not sure if they should go, mostly because their boss, Benson, is wondering if its a prank or a trick. In the end a friend of theirs named Skips convinces everyone to go just in case time really is at stake.

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Future Rigby would've been the mentor if he hadn't died, but a friend of theirs known as Skips is actually immortal, experiencing a lot, becoming very wise, learning how everything works quickly, teaching Mordecai and Rigby what to do and not to do.

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In this case, the Threshold is where they already are but in the past, they go into Future Rigby's ship and learn how to pilot it before going 10 years into the past.

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Mordecai and Rigby's allies are their friends being Benson who is their short tempered boss that is also a gumball machine, Skips who is the wise mentor that is an immortal yeti, Pops who is the lighthearted and wholesome one who believes there is a little good in everyone, having a giant head and dressing like a gentlemen, Muscleman who is the typical prankster, being a normal human with green skin and High Five Ghost who is the reasonable one that is also just a ghost. There are no trials but there are only two enemies, Randall Ross who is the big bad leader of it all and Future Mordecai his right hand man.

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Thinking they destroyed the device, they ran back to celebrate before being stopped by future Randall Ross, who revealed he knew about their plan and had replaced the broken one with a perfectly new one, revealing it was too late. Right before the heroes attempt to confront him, he begins hinting at a dangerous secret Rigby has been keeping from Mordecai for the past 10 years, urging him to say it before handing Rigby a letter to him, urging him to read it for a while before Mordecai gets irritated and yells at him to read it already, in which Rigby replies and reveals that he didn't want to seperate from Mordecai ever, and 10 years ago he figured out Mordecai got into his dream college before Mordecai himself even found out, and that himself aka Rigby did not. Rigby was scared they would stop being friends after separating for a couple of years so he trashed the letter and forged a false one in which stating Mordecai did not get into college, putting it in his mailbox, lying to Mordecai that he got into college but would rather skip it and stay with Mordecai, which in return ruined Mordecai's dreams.

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After Mordecai hears Rigby's confession, Randall gets bored and tries to kill them with a ray gun, in which Future Mordecai comes in and blocks the shot while firing his own at Randall, landing the shot, forcing Randall to retreat as the device did its thing, making it too late to destroy. Mordecai was still unbelievably upset at Rigby, telling him that he's not his friend, but a screw up that's done nothing but ruin his life constantly, causing Rigby to go into the ship alone, taking off without everyone, flying through space, trying to go home and wait for time to be erased along with him, while the others take Future Mordecai's spaceship with his permission as he slowly asks Mordecai to not hate Rigby for it, wishing he could've gone out while playing video games with Rigby one last time before dying in Mordecai's arms. Rigby stops by a space gas station to fill up before a nearby explosion, due to a gas malfunction, knocks out Rigby, causing him to wake up to none other then Father Time, assuring him this is not the way and that he and Mordecai are the only ones who can save time and himself along with it. Rigby asks what's the point considering everyone hates him, in which Father Time replies with how he and Mordecai have gone through many tough times and got through them together in the end, growing and learning from it, assuring Rigby the same would happen again, motivating Rigby to snap out of it and go help Mordecai and his friends save Time.

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Mordecai and his friends had met other friends of Future Rigby, borrowing their ships and having a space war, Mordecai being able to get inside before being held at gunpoint by an enemy soldier, Rigby crashing in the same room Mordecai was in with his ship, slamming into the enemy and saving Mordecai, the two running into the main control room where Randall was, the two having a final showdown with him, getting beat up by Randal in the process, but barely able to take him down. Their friends walk in, not able to find a way to shut it down before Rigby decides to sacrifice himself for the greater good, grabbing a barrel of unstable toxic waste to throw into the machine to blow it up and himself in the process. His friends run out as Rigby struggles to move the barrel, Mordecai coming to help him carry it, deciding to sacrifice himself and go out with his best friend in the process.

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As they throw the object into the machine it blows up and knocks them into space, moments from death before getting saved by their friends driving the spaceship. Mordecai, Rigby, and their friends are greatly awarded before being told how to head home, doing so with their brand new permanent ship.