Luann van Houten confronts Marge Simpson, demanding to see Homer. Marge finds a deeply depressed Kirk van Houten in a vault and tries to snap him out of his funk. She offers him medication, but Kirk initially refuses, preferring his manic state. Marge convinces him to take a pill, and then, to her astonishment, the 'Aqua Rocket' that Kirk had been funding launches from his house. Marge and Kirk explore underwater, with Marge finding excitement in Kirk's manic energy, despite his constant complaints about the rocket's flaws.