SpongeBob SquarePants, Sheldon Plankton: Mean and Green Season 1 Episode 1 F.U.N.

SpongeBob SquarePants: Sheldon Plankton - Mean and Green is a spin-off of the popular animated series SpongeBob SquarePants, focusing on the misadventures of Sheldon J. Plankton, the tiny and devious rival of Mr. Krabs' Krusty Krab restaurant. In this first season's premiere episode, titled F.U.N., Plankton hatches a plan to steal the secret formula for Krabby Patties, but finds himself in an unexpected friendship with his target, SpongeBob.

The episode opens with Plankton devising his latest scheme to get his hands on the secret recipe that makes Krusty Krab's burgers so delicious. He comes up with an elaborate plan involving a remote-controlled robot, but just as he is about to put it in action, he hears SpongeBob's voice singing a catchy tune: "F is for friends who do stuff together, U is for you and me, N is for anywhere and anytime at all!"

Plankton is annoyed by SpongeBob's cheerful singing and decides to use it to his advantage by pretending to be friendly and luring SpongeBob into helping him retrieve the recipe. He approaches SpongeBob with an offer to teach him about "fun," claiming that he doesn't know how to have a good time and is missing out on life.

SpongeBob, being the innocent and naive character that he is, is excited to learn about fun and agrees to spend time with Plankton. Plankton takes him on a series of ridiculous and dangerous activities, including skydiving without a parachute, riding a giant jellyfish, and jamming out to rock music on Plankton's guitar.

Meanwhile, Mr. Krabs becomes suspicious of Plankton's sudden change of heart and sets out to investigate his rival's motives. He embarks on a mission to retrieve the stolen Krabby Patty formula and finds himself in the middle of SpongeBob and Plankton's supposed "fun" activities.

As the episode progresses, Plankton realizes that he is actually having fun with SpongeBob and begins to feel guilty about his plan to steal the formula. He tries to back out of the scheme, but SpongeBob mistakes his guilt for a lack of fun and pushes him to continue their adventures.

In a surprising twist, Plankton eventually confesses his true intentions to SpongeBob, who forgives him and tries to persuade him to give up his life of crime and make new friends instead.

The episode ends with Mr. Krabs successfully retrieving the formula and foiling Plankton's plan once again. SpongeBob and Plankton go their separate ways, but not before Plankton learns a valuable lesson about the true meaning of fun and friendship.

Overall, F.U.N. is a fun and entertaining episode that showcases the dynamic between two of the show's most iconic characters. It explores themes of friendship, trust, and redemption, all while delivering the trademark humor and zany antics that have made SpongeBob SquarePants a beloved animated series for decades.