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"Sandwich of Death" is the thirteenth episode in Season 4 (and ninety-second episode overall) of Regular Show. It first aired on January 28, 2013.
Mordecai and Rigby buy a potentially deadly sandwich at a restaurant, but when Benson falls ill after he eats it himself, they must set out to find the cure before he dies.
Mordecai and Rigby watch a commercial about the sandwich of death and they go to buy one. Then, the Sensai recognizes them and Mordecai and Rigby apologize for ruining his Death-Kwon-Do business. He forgives them and makes them the sandwich and Mordecai and Rigby goes home with it. After Mordecai and Rigby leave the sandwich unattended, Benson eats their sandwich (as payback for them eating his sandwich). When Mordecai and Rigby return, they find Benson green and choking so the three go to the Sensai's sandwich shop and ask for the cure. After Benson demands that they take him to a hospital, Sensai says that no western medicine can help him now. They must go see Sensai's sensei, the Grand Master of Death-Kwon-Do, so the quad travel to get the only known cure, the Sandwich of Life, from Sensai's Sensei within 6 hours or Benson will die.
Sensai explains the symptoms of the Sandwich of Death as each symptom is caused each hour. In the first hour, Benson will turn green and choke as what happened to him in the kitchen. In the second hour, his face will start to burn as what happened when he was in the car. In the third hour, his intestines will melt and leak out of his body. In the fourth hour, his vocal chords will have long since collapsed. In the fifth hour, he will regain his vocal chords, only to cry for mercy in forgotten ancient dialects. In the sixth hour, he will die, of course.
After Sensai tries to request a meeting, he forgot that the Master Sensei is still mad at Sensai so the group sneaks into the building. As they go into the first chamber, the must say "Step of Death" before they make a step or they will fall to their demise as they witnessed one of the guards falling. In the second chamber, they find more guards that appear with sickles. Then in the third chamber, they find guards with motorcycles and spike-ball chains that crash through the window when they appear. In the pathway to the fourth chamber, they see a mist of fog then guards with daggers ambush them. Then, in the fourth chamber, they encounter two fat people with axes that can crack through the floor. Then they encounter a guard with a hockey mask and artificial claws that can duplicate and then, after defeating all the guards, they reach the last chamber.
By this time, Benson is experiencing the fifth symptom, pleading in ancient dialects long forgotten. In the final chamber, there are two sandwiches, the Double Death Sandwich and the Sandwich of Life, but the cure is protected by the Master Sensei of Death-Kwon-Do, who is angry at Sensai for mass-producing the Sandwich of Death without his consent. After Master Sensei declining their request, he sends his guards to destroy them. Then Master Sensei gets a razor and shaves off Sensai's mullet, diminishing his Death-Kwon-Do powers. Angry after the act, Mordecai and Rigby tries to attack Master Sensai but is defeated. Then Master Sensai sends in the Double Death Sandwich, but Sensai sends in a new move called the Bicycle Kick of Death to counterattack the Double Death Sandwich and kills the Sensei. After that, Rigby gets the Sandwich of Life and Benson takes a bite, curing him. When the mountain self-destructs, the group escapes barely and almost dies in the avalanche. Mordecai and Rigby pay Sensai back by being in the Sandwich of Death commercial. Muscle Man and Hi-Five Ghost watch the commercial, and then, just like Mordecai and Rigby, they run to the sandwich shop.
- Death Kwon Do House Guards
- Grand Master of Death Kwon Do
- Muscle Man (cameo)
- Hi Five Ghost (cameo)
- Benson eats Mordecai & Rigby's Death Sandwich as payback, after they ate his Grilled Cheese Deluxe sandwich in the episode "Grilled Cheese Deluxe."
- Mordecai and Rigby apologize to Sensai for ruining his business when they stole some of his moves in "Death Punchies."
- This episode is a sequel to the season 1 episode, "Death Punchies."
- In a way, this episode serves as Benson's karma for eating Mordecai and Rigby’s ultimeatums in "The Best Burger in the World."
- The Sensai trilogy concludes with the Season 6 episode "Death Kwon Do-Livery."
- The waiver only said "You can not sue me" instead of saying not to leave the sandwich on the table.
- When Sensai, Mordecai, and Rigby are fighting The Grandmaster of Death Kwon Do's guards, Rigby jumps at the Double Death Sandwich. Either this is an error, or Rigby was trying to kill The Grandmaster.