Jellyfishing

The episode begins with a jellyfish swimming by SpongeBob's house, where SpongeBob and Patrick then observe it through a massive telescope protruding from a window in SpongeBob's house. They then slide down ropes (causing them to get rope burn) and put their jellyfish nets together, and SpongeBob puts on his glasses. They prepare for jellyfishing like a pro, but then meet Squidward and ask him if he wants to join them. He says that he can't go with them because he is "busy" and goes bicycling instead. SpongeBob asks Squidward if he can join them next time. Squidward sarcastically says yes and goes down the road.

Unfortunately, while he is biking, Squidward has an accident involving a jellyfish and gets his tentacles tangled in his bike's pedals, causing him to veer out of control and he tumbles down a cliff, then inexplicably explodes when he hits the bottom, leaving him ultimately wheelchair bound. SpongeBob and Patrick decide that what Squidward needs is a "Best Day Ever." It begins at Squidward's house where Patrick offers Squidward some alphabet soup. (For whatever reason, the doctors put bandages all over Squidward's body, including his mouth). Patrick blows the hot soup onto Squidward's bandaged face several times before SpongeBob says that soup isn't a good idea. SpongeBob then suggests that some music would be good, and gets Squidward's clarinet. He blows a bad note before realizing that his lips are too dry, and goes through several exaggerated motions of trying to wet his lips. A disgusted Patrick soon violently snatches the instrument away from SpongeBob, declaring music not to be a good thing for Squidward either.

SpongeBob and Patrick then declare that a Jellyfishing expedition would be in order for the "Best Day Ever." They then go to Jellyfish Fields, SpongeBob tells Patrick to give a net to Squidward, while he finds "a good specimen." Patrick explains that Squidward must, "firmly grasp [the net] it in your hand," but when Patrick fails to put a jellyfishing net in Squidward's cast-covered hand, he gets frustrated and he stabs it through Squidward's palm, much to his chagrin and pain.

He is not into it at first, but when a jellyfish stings him, he goes after it for revenge. He manages to catch the jellyfish and bangs his net triumphantly against a pink mass, but in doing so, he angers a queen jellyfish, who was the aforementioned pink mass. The queen jellyfish chases after him, while SpongeBob and Patrick obliviously cheer him on until the queen jellyfish zaps Squidward with an extremely massive sting, leaving their cheering replaced with cringing at poor Squidward's literally shocking misfortune.

The next day, SpongeBob and Patrick covered in band-aids meet outside Squidward's house and attempt to give a now life-support-bound Squidward the jellyfish that he caught the previous day as an apology. SpongeBob hopefully asks Squidward if he still isn't mad at them. Sure enough, he is, and he opens the jar and lets the jellyfish attack SpongeBob and Patrick as they sprint into the distance. As Squidward laughs, the Queen Jellyfish finds him and stings him again, destroying his life-support and shattering his body cast. A completely blackened Squidward can only say, "Ow" as the episode ends.