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"Cool Cubed" is the twenty-sixth episode in Season 4 (and one hundred-fifth episode overall) of Regular Show. It first aired on May 20, 2013.
After Thomas freezes his brain after chugging down a slushy, Mordecai and Rigby must go into his head to prevent him from being permanently brain-frozen.
The episode begins with Mordecai, Rigby, Pops and Thomas buying slushies from the convenience store and chugging them as fast as they can to see who can make the best brain freeze face. Everyone manages to get brain freeze except for Thomas, who for some reason wasn't able to. The other guys begin messing with him for not being able to get brain freeze, so Thomas rushes into the store and asks the clerk what the coldest drink they have is, to which the clerk replies is called Cool Cubed and contains real glaciers imported from the Arctic. Despite the clerk imploring Thomas to reconsider, he buys a Big Swig sized cup and drinks it, freezing his brain and contorting his face into something that's frankly a little creepy.
After the others figure out something is wrong, they attempt to thaw his brain themselves by wrapping a hot towel around his head inside the bathroom, but it doesn't work, so they end up going to Skips for help. He has never seen a brain that was that frozen, so he is unable to help, but he calls in Dr. Henry, who has treated Pops's family for generations.
Dr. Henry unfortunately isn't able to do anything himself, but he says that someone would need to minimize down and enter Thomas's brain to prevent the Cool Cubed from freezing the core, leaving him permanently in a state of brain freeze. Rigby initially tries to leave, but Mordecai forces him to stay, saying that they got Thomas into this mess, so they had to get him out.
Dr. Henry told them that they only had five minutes to fix Thomas's brain before they began growing again, so after he gave Mordecai and Rigby an arsenal of gear to thaw Thomas's brain, as well as gave Rigby a watch with the alarm set for five minutes from now, he shrunk them down and shot them inside Thomas's ear.
After traveling through the blood stream, Mordecai and Rigby climb out of the water, and notice that Thomas's brain was a frozen wasteland. They meet up with what looked to be a real goat, but it's face turns into Thomas's face, revealing that it was in fact Thomas's consciousness. The three of them then find the arsenal and load up, before chasing after Cool Cubed, who was already heading towards the core. He also had a translator with him as well similar to the translator from Caffeinated Concert Tickets. They begin chasing him with a truck that they found inside the box, but Cool Cubed sends a blast of ice to one of the truck's treads, causing the truck to crash.
As they were lying on the ground, stunned, Cool Cubed attempts to freeze them to prevent it from reaching the core, but Thomas's consciousness gets in the way, getting frozen himself. The translator attempts to stab Thomas's consciousness with a spear, but Mordecai and Rigby pull him out of the way, causing the spear to hit the ground and open up a large hole in the ground, sending the translator falling to his death.
Cool Cubed rushes off towards the core, forcing Mordecai and Rigby back into the chase. They eventually reach the core with Rigby holding back Cool Cubed while Mordecai lights a bundle of dynamite to thaw the core. Cool Cubed prevents that, though, knocking into Mordecai and sending the dynamite and matches into the hole, with the dynamite landing a few inches from the core. Sensing victory, Cool Cubed jumps into the core, intending to finish the job and freeze the core, but Mordecai shoots an arrow into the dynamite, exploding it and thawing the core, destroying Cool Cubed in the process.
As Thomas's brain begins to thaw, the five minute time limit expires and Mordecai and Rigby begin to grow. They begin frantically searching for the teleportation button as everything begins getting smaller. Eventually, they manage to find it and hit the button just in time, transporting out of Thomas and back outside. Thomas then returns to normal. The guys then show him the picture of his brain freeze face, and they all laugh before Thomas gets hit with a headache.
- Fast 'n' Easy Clerk
- This is the first appearance of Dr. Henry.
- The Cool Cubed and his Translator are similar to the Coffee Bean & Translator from "Caffeinated Concert Tickets".