The movie takes place at Fort Lox, home to over 5 billion Krabby Patties. Kelp Thing plans to steal all the patties, but Mermaid Man and Barnacle Boy try to stop him, because it is forbidden. Kelp Thing also tells them that they won't defeat him this time and the fight begins. This movie includes Sandy Cheeks as a double stunt for Mermaid Man, and karate chops Kelp Thing away. Then, Mermaid Man says that Kelp Thing may not win the Krabby Patties, but the battle rages on. The movie ends with Mermaid Man and Barnacle Boy showing up their rings and Mermaid Man saying "Mermaid Man and Barnacle Boy, unite!" and they put their rings together.
Narrator:[movie starts with him as SpongeBob on-screen, playing with a toy car near a box-made fort with the word "LOX" on it] Fort Lox: home to over five billion Krabby Patties. [scene cuts to the patty vault] What evil mastermind would dare infiltrate this fortified fort and make off with its treasure? [The patty vault is opened and a piece of kelp on strings comes down]
Kelp Thing: It is I, Kelp-Thing! I must do what I do! [is stopped by Mermaid Man and Barnacle Boy]
Mermaid Man:[on-screen] Stop! You can't do that, it is forbidden.
Kelp Thing:[angered] Well, watch me!
Mermaid Man: Prepare to feel my wrath, you foul villain. [Mermaid Man is about to fight when Sandy pops out as a stunt double]
Sandy: Have it! [she fights Kelp Thing by karate chopping him. Then Mermaid Man shows up on screen again]
Mermaid Man: You may have won the Krabby Patties, but the battle rages on. [real crabs are fighting] Mermaid Man and Barnacle Boy, unite! [both put rings together. Then 'FIN' appears on-screen]
The movie was first produced differently. Mermaid Man and Barnacle Boy were driving the invisible boatmobile (Pearl Krabs) and were pulled by Nat Peterson up a rocky hill. Later, Mermaid Man recited the plot of episode #912 before the movie ended. However, it was ruined because Patrick Star had the lens cap on.
The movie received negative reception from the fans, but they still enjoyed it very much.
The transcript of the movie is the fixed one with no skips. However, in the real episode, the movie included skips, like when they skipped Mermaid Man's "It is."