Caveman

"Caveman" is the seventeenth episode of Season 4 (and the ninety-sixth episode overall) of Regular Show.

Synopsis
After Mordecai and Rigby accidentally defrost a caveman, they try to civilize him so he can stay at the park.

Plot
The episode starts with Mordecai and Rigby entering a cave for an overnight camp out, activities being making s'mores, rocking out to the radio, playing video games, and talking about their futures. All the while, with a giant block of ice slowly melting into the night.

The guys finally turned in for the night, not knowing the block of ice had completely melted, revealing a Caveman. He woke up Mordecai and Rigby, and after a while, the duo think the Caveman is really cool.

When Benson saw him, he wanted Mordecai and Rigby to throw the Caveman out. But after some persuasion, Benson allowed them one week to teach the Caveman to be civilized.

With the help of Muscle Man, High-Five Ghost, Pops, and Skips, the duo were able to teach the Caveman, named Gregg, how to be civilized. Just when the duo were going to show Benson Gregg's progress, Gregg wanted to defrost his long-lost love, Dianne, who was hidden along with other members of Gregg's tribe in an enclosed cave.

When Mordecai, Rigby, and Greg bring Dianne back to house, she and Gregg tried to "catch up" with each other, but soon find themselves in an argument and Dianne left to defrost the rest of her tribe, leaving Gregg confused about who and what he is.

When the resurrected Cavemen and Dianne reek havoc on the Park, Mordecai, Rigby, and Gregg devise a plan to lure the Cavemen into the meat locker under the house. After leading the Cavemen into the meat locker, Gregg decides to stay with Dianne, feeling that it is best to stay with his love instead of being in the civilized world. As he was almost completely frozen, Greg was frozen with Dianne in his arms and giving Mordecai and Rigby the thumbs-up.

Depressed with the loss of their new friend, the duo run into Benson, who had seen what had happened and was amazed at how noble Gregg was. With tears in his eyes, he tells the duo to clean up the mess caused by the cavemen or they'll be fired.

Characters

 * Mordecai
 * Rigby
 * Gregg
 * Benson
 * Pops
 * Hi Five Ghost
 * Muscle Man
 * Skips
 * Snack Bar Kids (cameos)
 * Diane (antagonist until the end)
 * Other Caveman (antagonists until the end)
 * Party Pete (Cameo)
 * The British Taxi (cameo)

Gallery
The gallery for Caveman can be found here.

when the cavemen were unlocking the door and hi-fife-ghost and muscle man hid in the draw it was reference to the jurassic park scene