TV Guide Nickelodeon Sunday

Sheldon and Raj determine whether they can endure a dark-matter research exploration inside a salt mine; Leonard and Penny wind up arguing over money.

Penny's flirty sales method winds up attracting a lovesick doctor; Amy and Bernadette debate whether female scientists should be more sexually appealing.

Bernadette and Amy organize a high school prom on the rooftop of the guys' apartment complex; Sheldon feels forced to take part in the idealistic prom rituals.

Cameron's birthday falls on Leap Day, and the pressure for Mitchell to get it right is high; Phil's plans to celebrate the holiday are thwarted by the girls.

After Cameron's clown mentor passes away, he is reunited with his ex-clown partner; Phil is trumped by another agent when trying to land an important listing.

The whole family unites for some last-minute campaigning; Claire does some last-minute interviews, but has a few technical difficulties.

Claire helps Luke cope with the passing of his friend and neighbor Walt; Phil and Alex have some quality father-daughter time; Haley hosts an unapproved party.

The Dunphys are shopping for a new car; Phil makes an impulsive purchase without Claire; Jay is firm in going to his high school reunion with Gloria and Manny.

The Pritchett-Dunphy-Tucker clan encounters motion sickness, achy feet and a wayward toddler when they take a family trip to Disneyland.

Dave is stunned by Calvin's idea of camping when the two families go on a camping trip; Gemma and Tina meet a deceptively nice general store proprietor.

Spongebob and Patrick have to keep the job clean when they are hired to paint Mr. Krabs house; Krusty Krab produces a training video for future employees.

Squidward is forced to work at cleaning up Bikini Bottom as community service after a policeman catches him littering in public; SpongeBob buys Gary a pet.

Squidward wakes up in a time capsule and believes he traveled into the future; SpongeBob and Patrick create a world comprised of tikis for Squidward.

SpongeBob SquarePants falls asleep on the bus and ends up in a strange town full of Bikini Bottom doppelgangers; Squidward loses his memory.

When Patrick's Time Closet malfunctions, SpongeBob's history is re-written by time traveling interlopers.

SpongeBob, Patrick and the gang must go ashore in order to recover the Krabby Patty recipe page to stop a villainous pirate and save Bikini Bottom.

When Mr. Krabs is framed for stealing King Neptune's crown, SpongeBob and Patrick set out to retrieve it before the king unleashes his wrath.

When Squidward closes the gap in SpongeBob's teeth, it causes a dramatic and unexpected change in his demeanor.

Plankton explores SpongeBob's brain to steal the Krabby Patty formula; Plankton disguises himself as a robot of Mr. Krabs to steal the secret formula.

Gary protects the secret formula from Plankton while SpongBob hides it; Sandy must save the day after a freak accident makes the entire town as dumb as Patrick.

Plankton's family opens their own restaurant directly next to the Chum Bucket; SpongeBob suddenly finds everything funny, much to everyone's annoyance.

Mr. Krabs produces Krabby Patties on an industrial scale, but it causes problems between SpongeBob and Patrick.

Mr. Krabs worries that Plankton hasn't tried to steal the secret formula lately; Patrick discovers that SpongeBob's pineapple house has a library of books.

SpongeBob's life changes course unexpectedly when he gets a pair of longer pants; SpongeBob becomes the top customer at Larry the Lobster's new gym.

SpongeBob experiences a bad luck streak when his lucky tie clip suddenly goes missing; when Patrick can't fall asleep, he seeks assistance from the Sandman.

SpongeBob celebrates the anniversary of his friendship with Squidward; Squidward's lack of talent lands him in a court ordered music class.

SpongeBob and Patrick find out that a new highway is being built through jellyfish fields, so they become angry and decide to protest against it.

SpongeBob goes to great lengths to meet one of the figures he greatly admires; Mr. Krabs tries to motivate his employees by telling them a scary story.

Mr. Krabs goes into a frenzy trying to get the penny he thought SpongeBob picked up; SpongeBob is visiting the ship-shaped Boat Museum when it starts to move.

SpongeBob wants Squidward to visit his home, but when Squidward say that his own home is good enough, SpongeBob decides to decorate his home like Squidward's.

SpongeBob and Squidward try to sell Krabby Patties from a food truck in the darkest depths of the ocean; Pearl & Narlene have a whales' day out in the big city.

SpongeBob, Patrick and the gang must go ashore in order to recover the Krabby Patty recipe page to stop a villainous pirate and save Bikini Bottom.

Sheldon overreacts when Leonard must undergo a minor surgical operation for his nose; Howard and Bernadette work through their marital issues.

Sheldon records his final "Fun with Flags" episode; Leonard, Howard and Raj attempt to find something notable in a deceased professor's research.

Raj's impatiently awaits results from a space probe that he helped initiate; Leonard and Sheldon agree to go shopping for dresses with Penny and Amy.

Sheldon provokes the gang to challenge him so that he may ultimately reach a scientific breakthrough; Wolowitz designs a humiliating game about Raj.

An online critic picks apart Leonard and Sheldon's physics paper; Penny, Amy and Bernadette reflect on some of their more shameful moments from the past.

Jay and Gloria fight over lunch; Phil must fire Mitchell; Cam and Claire debate over disciplining children; Alex tries to complete a "living art" display.

Mitch and Cam ask Gloria to assist them as a translator in another attempt to adopt a second child; Claire and Phil get shocking news from Haley.

Phil takes Jay on a fishing trip; Gloria struggles with sharing her news; Dylan moves into the Dunphy's temporarily; Mitch and Cam decide to adopt a cat.

Phil goes in for a vasectomy; Jay and Gloria argue over finding out the sex of the baby; Gloria is in denial about needing maternity clothes.

When Phil and Claire drop Haley off at college, they wind up embarrassing her; Manny forces Jay and Gloria to take a baby class; Lily gets in a tussle.

Luke wants to quit magic; as a side effect of pregnancy, Gloria begins snoring, keeping the entire house awake; Mitch and Cam decide to swap duties.

Dave is elated to be invited to go golfing with Calvin; Gemma and Tina work together to execute a momentous surprise for Malcolm, Marty and Grover.

Dave wants to have a more important part in Calvin's annual barbecue, but Calvin's reaction signals there is more work needed to grow their relationship.