Goofy is the single father of teenager Max Goof, although the two have a tense relationship. On the last day of school before summer vacation, Max and his best friends P.J. and Robert "Bobby" Zimuruski hijack the auditorium stage in the middle of Principal Mazur's speech, creating a small concert where Max performs, while costumed as the pop singer Powerline. The performance succeeds in making Max a school celebrity and impressing his love interest, Roxanne, but he, P.J., and Bobby are sent to Mazur's office. While waiting outside of the office, Roxanne speaks with Max and agrees to go with him to a party where Powerline's concert will be viewed live on television. However, Mazur telephones Goofy and exaggerates Max's actions, forewarning him that Max's behavior may result in him facing capital punishment. Oblivious to Max's plans with Roxanne, Goofy decides to take Max on a fishing trip to Lake Destiny, Idaho, following a cross-country map route he and his father took years ago. Before they leave town, Max manages to stop by Roxanne's house to call off their date, but when the heartbroken Roxanne mentions going with someone else, Max panics and instead fabricates a story about his father knowing Powerline, telling her he will be on stage at the concert. Despite his son's objections, Goofy plans his own trip, with initially disastrous results. Max hurts his father's feelings after Goofy inadvertently humiliates Max at an opossum-based theme park. Later, Pete and P.J. happen to meet up with them while camping by a lake. While P.J. informs Max of how all their peers back home anticipate seeing him onstage at the Powerline concert, Pete advises Goofy to keep Max under control. Goofy takes his son fishing and shows him the Perfect Cast fishing technique, accidentally luring Bigfoot to their camp. Pete and P.J. flee, leaving Goofy and Max to spend the night with Bigfoot. At night, while Goofy sleeps, Max alters the map's route to Los Angeles, where the concert is taking place. The next morning, Goofy decides to make Max the navigator of the trip. The two go to several locations that satisfy both of them. Eventually, they stop by a motel where they meet Pete and P.J. again. When Pete overhears a conversation between the boys, he tells Goofy that Max has tricked him into traveling to Los Angeles. The next day, Goofy and Max come to a junction: one leading to Idaho, the other to California. Max chooses the route to California, making Goofy stop the car at the Grand Canyon and storm off in anger. With the brake loose, the car drives off on its own; Goofy and Max chase after it and end up in a river. After a heated argument, Goofy solemnly declares that no matter how old Max gets he will always be his son, and the two finally reconcile with each other. After learning of Max's promise to Roxanne, Goofy decides to take him to the concert in Los Angeles. The two nearly plummet to their deaths down a waterfall, but Max saves Goofy using the Perfect Cast technique. Goofy and Max make it to the concert, and while attempting to sneak backstage, they end up onstage and dance with Powerline, watched by Pete, P.J. and Roxanne on separate televisions. Goofy and Max later return to Roxanne's house in their damaged car. Max tells the truth to Roxanne, though she accepts it and admits she always had feelings for him, ever since the first time she ever heard him laugh, "Ah-hyuck!"; thus, a relationship starts between them. Goofy's car suddenly explodes because of damage it had sustained, ejecting Goofy in the process, who then falls through the porch roof of Roxanne's house, and Max proceeds to introduce him to Roxanne.
