"Squidward, the Unfriendly Ghost": When SpongeBob and Patrick believe they have killed Squidward and that he is now a ghost, he takes advantage of this by making them his slaves. Eventually, SpongeBob and Patrick, after reading a magazine about the Flying Dutchman's death, get the idea that Squidward is being mean and angry because he was never put to rest. SpongeBob and Patrick attempt to bury Squidward, which ultimately brings him to confess that he is actually alive. However, SpongeBob and Patrick still think that Squidward is a ghost in denial and send him to the "great beyond" by trapping him in a bubble, which floats up into the sky where the pelicans are.
"Employee of the Month": Squidward and SpongeBob viciously compete with each other for the employee of the month award, both of them trapping each other in hopes of getting to work first.
"I Was a Teenage Gary": SpongeBob leaves Squidward in charge of watching his house and Gary, Squidward neglects Gary instead sunbathing in the front of his house, this lead to Gary becoming horribly sick and have to be injected with snail plasma. It accidentally hits SpongeBob who later transforms into a snail which terrorizes Squidward. Squidward gets the snail plasma injected into him turning him into a snail, Patrick later throws a boot at Squidward because he wouldn't stop meowing.
"Fools in April": Squidward gets annoyed with SpongeBob pulling playful and harmless pranks on people at the Krusty Krab, and pulls a very cruel and harmful prank on SpongeBob in retaliation. Squidward then laughs at him when he comes out of the trash, which makes SpongeBob run out of the restaurant sobbing hysterically, and the Bikini Bottomites turn on him. Squidward tries to apologize, but he is physically unable to apologize until the very end of the episode, where SpongeBob has the last laugh: all of his friends were standing behind him in his house and witnessed Squidward's apology. As a result, Squidward suffers a mental breakdown and runs off back to his house laughing maniacally after shouting that he had just fooled them as well.
"Grandma's Kisses": Squidward and the customers at the Krusty Krab ruthlessly tease SpongeBob for having a kiss on his forehead given by his grandma. At the end of the episode, it is shown that they have been spying on SpongeBob with his grandma through her house's window.
"Pressure": Squidward mocked Sandy for not being a fish, and when she took off her helmet and started drowning, Squidward laughed at her and didn't care that she was dying.
"Can You Spare a Dime?": Squidward accepts SpongeBob's offer to live in his house until he finds a new job. However, he takes advantage of SpongeBob's hospitality by lying in bed all day and essentially making SpongeBob his domestic slave, staying so long that the French Narrator quits and not even attempting to find a job. This eventually proves too much for SpongeBob who for one of the few times in the series becomes angry with Squidward, who soon begins aggressively giving Squidward obvious hints to get a job, which Squidward either doesn't notice or chooses to ignore. Eventually, SpongeBob confronts Mr. Krabs in an attempt to force him to give Squidward his job back, and in the process accidentally reveals that Mr. Krab's first "dime" (a stone-age wheel) was in his pants the whole time, and that Squidward did not steal it.
"The Lost Mattress": While retrieving the mattress, Squidward nearly threatened to murder SpongeBob, and then he used him and Patrick as "worm bait." However, Squidward becomes the worm's prey.
"Funny Pants": SpongeBob's laughing annoyed him, so he told SpongeBob that he had a "laugh box" that would burn up if he laughed within 24 hours and could never laugh again. SpongeBob eventually thinks he lost his laugh and goes into "spiraling depression." which proves to be too much for Squidward to handle. He eventually faces karma when he himself breaks his own laugh box, prompting SpongeBob to give him a piece of his to Squidward, causing the latter to laugh exactly like him.
"Krusty Towers": He made several ridiculous requests with the purpose of driving Mr. Krabs crazy (though Krabs did have this coming).
"Good Ol' Whatshisname": Squidward steals What Zit Tooya's wallet, ran a red light in front of a police officer, is arrested, and was sentenced to ten years in prison.
"Slimy Dancing": Squidward controls SpongeBob after pulling off his limbs and putting his in their place to enter a dance contest.
"The Splinter": Squidward tells SpongeBob that Mr. Krabs will have to kick him out for getting a splinter at work.
"Professor Squidward": Squidward says he is Squilliam and impersonates, but the principal finds a real Squilliam and then Squidward was arrested and sent to jail.
"I ♥ Dancing": Squidward gets jealous that SpongeBob has an audition in a musical, and "teaches" him how to dance in order to steal the spot for himself, training SpongeBob to the point of exhaustion. While he wins, he is to star in Squilliam's musical, and is forced to train to perform a dance that SpongeBob had performed earlier, with Squilliam clearly planning to run him ragged just as Squidward had done to SpongeBob.
"Sponge-Cano!": He scolds everyone in the Krusty Krab and yells at SpongeBob for humming.
"That Sinking Feeling": He tried to separate SpongeBob and Patrick by drawing a line, and later, he threatened them that if Squidward's house was not back to normal on the count of three, he will grind them into chum (kill them).
"New Fish in Town": He dragged SpongeBob, Patrick, and Howard's homes down a trench.
"Accidents Will Happen": He lies to SpongeBob and Mr. Krabs about his accident which he was actually sleeping on the shelf.
"Restraining SpongeBob": Squidward had a restraining order placed on SpongeBob to keep SpongeBob away from him. When Patrick began to annoy Squidward far worse than SpongeBob, he released SpongeBob, and added Patrick to said restraining order.
"Are You Happy Now?": He destroys all the paper mache copies of SpongeBob in a rage.
"Little Yellow Book": Squidward reads SpongeBob's work diary in front of the customers, which made SpongeBob sad. He sees that he has been known as a "diary thief," but does not feel be until his house was repossessed. Later, he even reads SpongeBob's personal diary, and doesn't even show regret of his actions even after he begs for SpongeBob to forgive him.
The SpongeBob Movie: Sponge Out of Water: Squidward, along with Mr. Krabs and the other Bikini Bottomites, try to kill SpongeBob as a sacrifice for the "sandwich gods", believing that doing so would bring Krabby Patties back to Bikini Bottom, and they only stop after SpongeBob and Mr. Krabs smell Krabby Patties coming from the surface.
"Don't Look Now": Taking advantage of SpongeBob and Patrick's cowardice, Squidward pretends to be the Fisherman in order to play a cruel joke on them. As a result, SpongeBob and Patrick misinterpret the Fisherman eating Squidward, they in reality end up injuring Squidward.
"Patrick! The Game": Squidward destroys Patrick's board game in a rage, but he gets arrested by the police for his vandalism.
"Mermaid Pants": He and Mr. Krabs played as supervillains to against SpongeBob and Patrick who play Mermaid Man and Barnacle Boy.
"Unreal Estate": He tricks SpongeBob into fearing that he is allergic to his pineapple house.
"SpongeBob's Place": He requests health department to shut down the restaurant.
"Sportz?": He has SpongeBob and Patrick play sports as a result in order to get them hurt on purpose, such as having them throw horse shoes at each others faces. Sandy decides to go against Squidward in playing sports where she ends up humiliating him in the process.
"Spin The Bottle": He fights Patrick, and Mr. Krabs for a bottle that contains a genie actually Plankton in disguise and tries to get it to have a successful music career, the previous genie of the bottle puts him, Mr. Krabs, Patrick and Plankton into the bottle leaving the four of them stuck inside it."
