Phil (Paul Walker) and Stew (Steve Van Wormer) Deedle are two wealthy but dimwitted Hawaiian surfer’s twins. The day of their 18° birthday they’re carry off by their friends, to celebrate with sky surf. But they’re caught by the school police, and expelled. Their father (Eric Breaden), hoping to straighten them out, sends them to specialty boot camp in Wyoming, managed by his old veteran friend Major Flowers (M.C. Gainey).

The twins fly in the foreign and cold Wyoming, celebrating the landig with spicy Hulas . The meeting with Major Flowers it’s quite different than how expected, he looks more like a tramp, and he confess that the camp do not exist anymore, but he’s determined to transform them in real men anyways. A missed bend on the road spoils his plans, the trunk they’re travel on flies on the tent of Mo (Megan Cavanagh) and Mel (Ana Gasteyer), two naturalist ready to become rangers in the near Yellowstone National Park, making them run away totally scared, and ending the fly into a river. Wet and with no traces of Major Flowers, Phil and Stew use the abandoned clothes of Mel and Mo, and with their special motorized skateboards their try to reach the airport to come back home. On their travel they cause an incident involving a circus trunk, with the consequent liberation of the wild animals, including a bear and a lion, who induce the poor Mo and Mel to climb and survive for days on a tree. Meanwhile, Phil and Stew finish their travel into the sign board of Yellowstone, and the acceptance letter of Mo and Mel found in the clothes leads the chief ranger Capt. Douglas Pine (John Ashton) to mistake them for the two rookie rangers.

Waking up in the camp hospital, Stew proposes to get this chance to demonstrate to their father that he could be proud of them, earning the ranger’s badges, but Phil don’t agree, just the meeting with Lt. Jesse Ryan (A.J. Langer) change immediately his mind. Pine entrusts them a task: free the park from a colony of prairie dogs, that could ruin the imminent party for the billion birthday of the famous geyser Old Faithful.

The prairie dog infestation is part of a plan orchestrated by the vengeful former ranger Frank Slater (Dennis Hopper), used to excavate a gallery to destroy the old geyser, and spoil the celebration. Phil and Stew try to fit themselves in their new naturalist roles, making a lot of pickles as usual. While Stew is searching for a way to resolve the pairie dogs problem and Phil is courting Jesse, who’s unfortunately also the step-daughter of Pine, Slater charges his henchmen Crabbe (Richard Lineback) and Nemo (Robert Englund) to stop the twins, with no luck. The arrive of Mel and Mo discloses their real identities, the Deedles are throw out of the park by helicopter, but during the flight, Pine falls out into a river, and only their surf’sexperience could save him. During the Hawaiian pre-party of ceremony of the hand out of the badges, Slater steals the plan projected by Stew, so the day after, he could use these information to destroy the old gayser, and lay the blame on them.

The Deedles are throw out of the park again, but Stew notice in the satellite pictures of the park that the gallery of the pairie dogs leads to the old geyser, so they decide to find the starting point of the tunnel, to discover who had them. They found a trailer on the starting point, and inside they discover that it was Slater the mind behind the death of Old Faithful. Captured by Salter’s men, they found out that the Old Faithful is not death, but entrapped by Slater who wants to transfer it into a deceased geyser placed into his property, to create his own personal park, and steal tourists toYellowstone. Meanwhile, Pine is trying to earn time during the Billion Bithday party,  to do not explain why the Old Fithful is not erupting anymore, but the Deedles are hard to give up.

A.J Langer and Paul Walker used real worms for their worm-snarfing scene. "We said, 'Let's use real ones.' And next thing, we were shoving big-daddy night crawlers in our faces. It was raunchy, but at least crused Oreos were used for dirt."

It was the first theatrically-released film to be produced by DiC Entertainment since 1986.

In the DVD, during the last credits, you could see a little scene about Mel and Mo new love’s interests!