Chomper Nut - Half-hour epsiode; Season 10 Finale
Plankton unleashes what may possibly be his greatest plan ever. SpongeBob will have to risk his heart and sympathy to save Bikini Bottom from impending doom.
The only other thing I can tell you is that it'll have a sad cliffhanger ending that'll be resolved in SpongeBob SquarePants: Big Road Trip.
Here is Season 10 (updated, with synopsises):
SpongeNerd CoolPants (half-hour Patchy special) - After Patrick's old college friends call SB a nerd, Patrick decided to make SB cooler.
Fancy Mess/Pie Ya Glad? - Stevie has his first date with Gabby/SpongeBob tries to make a pie for Patrick, but Patrick keeps being picky about his pie.
Sandy Stevie/Rise and Sombrero/Drive-Through Woes - Stevie expierences Sand Mountain for the first time/a brief look at Producer Randy's everyday morning/Patrick gets hired as the drive-thru guy at the Krusty Krab.
Calling It Quits (half-hour special) - Squidward offically quits his job at the Krusty Krab, and this time, he's serious.
Fair and Unfair/Easter Island Headache - SB, Pat, and Stevie try to expose a counterfieter/After the neighborhood gets destroyed, SpongeBob, Patrick, and Stevie have to bunk in with Squidward.
Cousin Shock/Angry Mob/Game Freak - Gabriella's identical twin cousin comes for a visit/Squidward finds himself the victum of a random angry mob/SpongeBob gets addicted to video games.
The Krabby Patty Burglar/Gooey Gooey Ink - SpongeBob invesigates a robbery at the Patty Vault/SpongeBob gets octopus ink squirted on him and can't get it off.
The Great Snail Race 2/Robot Warz - Gary, Freddie, and Coral compete in the newest snail race/SB, Pat, and Squid all enter a robot competition.
Mermaidman and Barnaclebot IX/Old and Olderer - SB and Pat worry about their againg heroes/Sandy invents a device that causes a freak accident between her and SB and Pat, aging them with each passing mintue.
Koolio Krab/ST4018: The Day-on Off - Mr. Krabs tries to win over his daughter by becoming gangsta-cool/Spongetron expieriences a non-work-day-on in Bikini Viron.
They Would Never Say That 2: EXTREME RANDOM CHAOS!!! (half-hour special) - A sequel to the classic fic with even more random chaos then the first, and also featuring alternate Stevie for the first time ever.
Mrs. Puff, Will You Marry Me?/The Nutcracker/Untitled Episode - Mr. Krabs decides to propose to Mrs. Puff/Stevie tries to open a tight nutcracker/a third episode that will remain secret.
SpongeBob SquarePants's Pineapple of Horror II (TV Movie) - A sequel to the previous Halloween special with a reoccuring food theme running throughout.
Chomper Nut (Season 10 finale) - See above.
SpongeBob SquarePants: Big Road Trip (theatrical film; fan series finale) - When SpongeBob thinks everyone has forgotten his birthday, Plankton tricks him into thinking that nobody cares about him and he deicdes to leave Bikini Bottom forever. Patrick, Sandy, and Stevie must go after him.