Sun, Surf, and Science is the third part of the 33rd episode of season 2 in Dexter's Laboratory, which first aired on April 1, 1998. In this episode, Mandark partakes in a surfing contest to steal Dee Dee's heart, which was claimed by another surfer. Mandark wants to impress Dee Dee by beating him.
Mandark is relaxing on and studying the beach until he sees Dee Dee. He is lovestruck by her and tries things to get her to like him, such as getting a new hairdo, but none of it works. He sees that there is a surfer boy who she already has eyes for, which makes Mandark jealous. He sees that there is a surfing competition, and he has the idea to join in and beat the surfer boy to make Dee Dee love him.
Mandark tries his hands at surfing but seems to be doing terribly. He gets washed underwater and just when he is about to give up, he gets a talk from the Tiki God about his surfing skills. After being washed up, Mandark goes to his laboratory so he can build a surfboard that is modified to fit his tactics. He also rigs the surfing area with booby traps so that the other surfers (especially Surfer Boy) would lose.
The next day is when the contest starts. It turns out that Surfer Boy is not in it and Dee Dee has made a last minute entry, meaning that she will fall into Mandark's traps. He protects Dee Dee from all of the traps so she doesn't die in them, while he falls in them himself and starts drowning until Surfer Boy saves him. Dee Dee wins the contest and while the crowd cheers and tosses her in the air, Mandark and the Surfer Boy become friends and they both leave the beach to his laboratory to surf in Mandark’s wave pool.