Spoiler warning! This article contains plot details about an episode you may not have seen. Read with care!
Mermaid Man and Barnacle Boy is the 12th episode in the first season of the hit television series, Spongebob Squarepants. The episode begins with Mermaid Man and Barnacle Boy starring in a classic episode of their T.V. series, Mermaid Man & Barnacle Boy (T.V. Series) defeating yet another villain. Then, Spongebob Squarepants and Patrick Star are shown in the Mermaid Man and Barnacle Boy suites reacting the scene by watching Squidward Tentacles, whom is comfortably lounging in his front yard. Spongebob and Patrick imagine that he is Reflecto, a villain of Mermaid Man and Barnacle Boy. They try to stop his ruthless power by calling the creatures of the deep, a jellyfish wondering by, but Squidward blows it away. Next, they place a tent above Squidward/Reflecto. Squidward destroys the tent and chases Sponegbob and Patrick back to Spongebob's House. Squidward arrives and tells them to talk to Mermaid Man at Shady Shoals Retirement Home on the other side of town. Some time later, Spongebob and Patrick go to Shady Shoals. Upon being lead to Mermaid Man and Barnacle Boy, whom are watching T.V. Spongebob and Patrick fearfully walk up to Mermaid Man and Barnacle Boy. Spongebob bashfully asks if they were Mermaid Man and Barnacle Boy. Barnacle Boy tells them that they used to be, now being retired. Spongebob is angered by this, telling them that they can't retired because their was evil afoot. Mermaid Man goes crazy opon hearing this shouting evil, and running around the retirement home. Spongebob and Patrick are kicked out of the retirement home. Afterwards, Mermaid Man and Barnacle Boy go through the lunch line and begin to eat. Spongebob walks into the cafeteria, and talks to Mermaid Man and Barnacle Boy. He tells them about old episodes, making Mermaid Man smile, while Barnacle Boy put his palms to his face and shakes his head. When Spongebob mentions coming out of retirement, Mermaid Man becomes angry marrying Spongebob to a receptionist, in a joking manner. Spongebob is kicked out of the retirement home again, rolling to his home. Soon after, Mermaid Man and Barnacle Boy are shown rocking outside. Spongebob enters wearing a blouse, and fakes a crime when Patrick, disguised as a thief, takes Spongebob's purse. Barnacle Boy confronts Spongebob telling him not to disrupt Mermaid Man's sleep. Mermaid Man and Barnacle Boy shout at each other while Spongebob and Patrick paint the invisible boat mobile. Barnacle Boy is out raged by this, challenging Mermaid Man and he to come out of retirement. They reunite, throwing water balls at the villains to no effect. Then, they try to use the raging whirl pool also to no effect. Next, they call upon the creatures of the deep. All the elders at the retirement home come to Mermaid Man and Barnacle Boy's aid, and throw Spongebob and Patrick out. To end the scene, Mermaid Man and Barnacle Boy happily shake hands. Finally, Spongebob and Patrick watch a new episode of The Adventures of Memaid Man and Barnacle Boy.