"The Return of Chef" is the first episode of Season Ten, and the 140th overall episode of South Park. It aired on March 22, 2006.
Chef returns after his stay with the Super Adventure Club. Stan, Kyle, Cartman, and Kenny notice there's something different about him.
In a fictional 'Previously on South Park...' segment, it is shown that Chef has gone away to stay with the Super Adventure Club because he seeks adventure in his life. The boys, including Cartman are extremely saddened, giving him a tearful farewell.
Three months later, the boys are sitting around, sad and bored. Suddenly the door rings and Stan goes to answer it. It is Chef! He exclaims his usual, "Hello there children!". Stan exclaims that Chef is back and the boys run up to him and hug him.
The townsfolk are all delighted to have Chef back, who is staying at Jimbo's for the time being. Chef answers the questions of the residents and reveals he is still part of his club, but is living with all his old friends. As Chef leaves, only the boys have noticed the change in Chef's voice.
Next day at school, the boys stand in line for lunch looking forward to Chef's meals. Clyde walks up to the boys and tells them that he thinks Chef wants to have sex with him. The boys ignore this believing Clyde to be wrong. As they reach the front of the queue, Chef asks if they want to meet up and make love. The boys are confused. He can't be serious. He is, unfortunately. The boys are horrified, and Chef continues his perverted conversation.
Soon, police arrive at the school to question the pupils about Chef explaining he is believed to be a pedophile. A cop uses a doll to question and demonstrate the possible ways Chef may have molested the boys. It's very thorough. Later, Chef asks the boys over to his place to make love. The boys warn Chef he has to stop, but he ignores this and continues his pursuit of man-boy love.
The boys then take a trip to the Super Adventure Club to find out what actually is wrong with Chef. They discover that the Super Adventure Club goes adventuring round the world, having sex with children. The boys realize that Chef has been brainwashed by the club.
The next thing they do is take Chef to a psychiatrist, who determines that the best course of action is to get Chef to return to his old pastime, having sex with women. He takes them to the strip club Peppermint Hippo. Chef does not seem interested in the women there and they prepare to leave, but he then notices a large black pole dancer who he immediately falls for. He then realizes that he has been brainwashed and blurts out, "I'm gonna make love to you woman!" as he would do before. He apologizes to the children, but suddenly the Super Adventure Club hit him with tranquilizer darts.
Taken back to the club's headquarters, Chef is being hypnotized again. The boys arrive and the club's leader William Connelly explains to them their history. He reveals that the club's founder used to cross the world trying to be the first to reach somewhere, but was always beaten. He realized that if he couldn't beat people getting to a place then he could be the first to have sex with the native children. As time progressed, the founder believed that by having sex with children he was becoming immortal because small things called marlocs in the children's bodies were entering his. He "lived for eternity until he was hit by a train in 1892." The boys try to point out how ridiculous the whole story is, but Connelly believes it to be no more ridiculous than any other religious parable.
Connelly then tells the boys to leave but they refuse. They won't go. Not without Chef. The four burst into Chef's room and try to free Chef. They manage to escape thanks to an attack move from Kenny and cross the rope bridge to freedom. On the other side the club's members remind Chef that he left his home because he sought adventure and his life being dull. The boys respond by telling Chef they love him. He apologizes but crosses the bridge to the club. Suddenly, a bolt of lightning hits the bridge and Chef catches fire. He then falls off the burning bridge, hitting the rocks on the side of the ravine as he does so, and is then impaled on a branch. A mountain lion then appears and attacks him, followed by a grizzly bear, and one of the club members tries to shoot them, but due to his bad aim he ends up hitting Chef instead. Finally, the bear and lion rip his face off and tear his body apart, seemingly killing him.
As he lies dead, the boys look in horror. Stan says, "Oh my God, they killed Chef," and Kyle angrily yells, "You bastards! You bastards!", which is done in the same style of how they used to react to Kenny's deaths. The club comments he would have made a great member. Cartman offers the boys a ray of hope that Chef may not be dead, as "the last thing you do before you die is crap your pa...!" , at which point Chef's body voids its bowels. The boys are resigned to the fact their best friend is dead.
Back at South Park, a funeral is held, the coffin containing Chef's spatula. Kyle explains they should not be mad at Chef, but at "that fruity little club, for scrambling his brains". The town comments that Kyle is right, and he adds that he believes a good part of Chef is still out there, alive in their hearts.
Back at the Super Adventure Club, Chef's corpse is pulled into an suit reminiscent of Darth Vader's, complete with a glowing red spatula. He answers Connelly asking if he would like to suck on his Chocolate Salty Balls, but he does not mean the confectionery, he means his testicles, much to Connelly's luck.