"Regular Show's" overarching plot, hidden beneath its episodic shenanigans, culminates in a cosmic battle for the fate of the universe. The key to this is the true identity of Pops. He is revealed to be Mega Kranus, a god-like alien of pure good from the planet Lolliland. His evil twin brother is Anti-Pops, a being of pure destruction. Their existence is locked in a cycle: every 14 billion years, they are destined to fight, and their clash resets the entire universe, erasing everything.
The entire eighth season, titled "Regular Show in Space," is dedicated to this plot. After Rigby's high school graduation, the park is launched into space to train Pops for the final battle. The finale, "A Regular Epic Final Battle," sees them return to Earth for the climactic confrontation. When Pops realizes that their fighting will only lead to another universal reset, he chooses a different path. He embraces Anti-Pops in a hug, telling him he loves him, and flies them both into the sun. This act of love, not violence, breaks the cycle permanently, saving the universe but killing them both. The series concludes with a 25-year time jump showing the crew living their adult lives: Mordecai is an artist married to a new character, Rigby and Eileen have children, Benson finds love, and they all reunite as middle-aged friends at the park to honor a statue of Pops, confirming their enduring bond.