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If you were looking for the article about the episode, then see Mermaid Pants.
Him and Barnacle Star were playing Mermaid Man and Barnacle Boy in the episode "Mermaid Pants." The first thing he does is answer phone in his house and then runs outside to play Mermaid Man and Barnacle Boy with Barnacle Star. They then see Squidward, who they think is Dr. Negative, and attack his vegetable garden, and then eats the vegetables. When Squidward is about to clobber Mermaid Pants and Barnacle Star, they remind Squidward he's running late for work. At the Krusty Krab, Mermaid Pants and Barnacle Star sing the Mermaid Man and Barnacle Boy theme song, making Squidward annoyed. After he tries to get them to stop talking about Mermaid Man and Barnacle Boy, they see a fish with toilet paper attached to his foot, but they think he's been injured. Mermaid Pants and Barnacle Star mummify the fish, put him in a wheelchair, and put peroxide on his eyes, making the fish angry and moves away from them. Squidward tells them to take out the trash, but instead, they punch the trash, and the Krusty Krab is dirty, and all the customers leave. After Mr. Krabs, dressed up as Captain Tightwad, and Squidward, dressed up as Dr. Negative, fight with Mermaid Pants and Barnacle Star, Mermaid Pants points out that no superhero should fight a super villain unless that super villain has committed a crime. They go to a bank for Captain Tightwad and Dr. Negative to pretend to rob it, until they get beat up by a security guard. Mermaid Pants decides to skip to the end of the story and pick up evil supplies for the super villains. Later, Captain Tightwad and Dr. Negative have Mermaid Pants and Barnacle Star over a pool of boiling oil, but Dr. Negative plots to actually fry Mermaid Pants and Barnacle Star. However, they tip over the lift and are set free, but Captain Tightwad and Dr. Negative get fried. Mermaid Pants and Barnacle Star then fake drive into the distance.
Shortly after entering Squidward's house to spy on their new temporary neighbour, SpongeBob and Patrick discover that the new neighbour was actually Man Ray. Upon finding this, they go to the Shady Shoals Rest Home and discover that Mermaid Man and Barnacle Boy were put into 'chronic sleep', and also learning they would not be awake for another week. They then use Mermaid Man and Barnacle Boy's rings and turn themselves into Mermaid Pants and Barnacle Star. They then return to Squidward's House, where they at first sneak in, before tumbling downstairs soon after. They then cause a ruckus in the living room along with Man Ray, eventually being pulled up and causing Man Ray to snap and return to his evil self. Before they began to battle however, the sound of thunder caused them to get frightened and fall down. Man Ray then receives a call from Squidward that he was returning early, and was expecting the house to be fully clean, which then after he flees. Mermaid Pants and Barnacle Star then use their saliva powers to fix up Squidward's house, albeit its later failure.