After SpongeBob and Patrick accidentally release the magical bag of winds, David Hasselhoff arrives and takes them to Bikini Bottom. While SpongeBob and Patrick ride on Hasselhoff, a fisherman looks at them and falls to the sea.
Suddenly, Patrick notices the bigger boot moving towards them and Dennis emerges from the boot when it reaches Hasselhoff. Dennis swats Patrick away, who tells SpongeBob to flee from Dennis, who stabs Hasselhoff's butt in the process.
After Dennis is defeated, Hasselhoff places SpongeBob and Patrick on his pecs that turn to launchers to send them back to Bikini Bottom. Hasselhoff celebrates after sending SpongeBob and Patrick back home but he gets burnt by King Neptune.
He makes two cameos. He first appears kayaking, when the French Narrator's submarine knocks him over, to which he replies "Tartar sauce!"
He is then seen on the beach at the end of the episode, and the tour bus runs over his feet. Patchy and Potty then show up, and Hasselhoff accuses Patchy of running over his feet, pulling Patchy's hat down.
At the end of the episode, he can be seen wishing SpongeBob a happy birthday.
He is also very famous outside of the SpongeBob SquarePants world. He seems to be part cyborg or android, as he is able to propel himself forward without swimming, like a motorboat. His pectorals extend outward, allowing him to place SpongeBob, Patrick, and King Neptune's crown in between them so they can reach Bikini Bottom in time.
Role in video games
The SpongeBob SquarePants Movie video game
His role in the video game is identical to his role in the film. He appears in the level "Dennis Strikes Back!" After SpongeBob and Patrick get King Neptune's crown and a lift from David Hasselhoff, the Cyclops’ boot returns, along with Dennis, prompting another boss level from him.
He appears in the levels "Hold the Hasselhoff" and "The Return of Dennis."
Even though David Hasselhoff appears both in the movie as well as the console version of the game, he is not directly mentioned in the PC game. His character is rather referred to as "......" even though he only appears on one artwork. This artwork at the end of chapter 7, "Shell City," shows a silhouette of a cartoon version of Hasselhoff.