Al Gore visits South Park Elementary, and talks about the terrible ManBearPig, who roams the Earth. ManBearPig is "half man, half bear, half pig; I'm super serial." After the boys' basketball game is interrupted by another visit from Gore, who is disguised (poorly) as the ManBearPig, Randy says the former American Vice President is just desperate for attention, because he has no friends. Al Gore then phones Stan in the morning when it is still dark, and begins pestering him. Gore then breaks down on the phone, and Stan reluctantly agrees to go to a meeting, where Al Gore tells Stan and his friends that Manbearpig is hiding in the Cave of the Winds. At first the children are reluctant to go with him; but when he explains that he will excuse the children from school, they agree to go, though they are extremely nervous about going to see the infamous Manbearpig.
In the cave, Al Gore forces the kids to follow him off the path and begins shooting wildly with a shotgun while exclaiming," I've got you now, you son of a bitch!!", causing a cave-in that leaves the kids trapped in the caverns, but allowing Gore to exit the cave safely. While there, the boys search for a way out, and Cartman discovers a small cavern filled with what appears to be gold, pearls, and other treasures, but is later revealed to be fake "treasure", worth about "14 dollars". He keeps the others from locating it, and starts swallowing the presumed treasure piece by piece to secretly smuggle it out of the cave.
Meanwhile, a rescue team has been assembled to find the boys, despite Al Gore's pleas that the caves should be filled with molten lead in order to kill Manbearpig regardless of the children. He then diverts the flow of a nearby stream in order to cause a flood that fills the cavern in an attempt to kill the monster.
The boys meanwhile believe that Cartman — bloated with fake gold and jewels — is ill, and try to find a way out, carrying him. The cave soon floods, and Kyle risks his life to get Cartman to safety. The boys manage to escape just as a memorial service is being held for them. They scream at Al Gore for using Manbearpig to get attention, and when Cartman poops out all the fake gold they scream at him too. It is Cartman's turn to be upset when it is revealed to him that the treasure is fake. At the end of the episode, Al Gore dons a superhero cape and exclaims his intention to make a film starring himself, yelling "Excelsior!!" as he runs away.