Beavis and
Butt-Head discover that their television has been stolen and set out to find it. After several failed attempts to obtain one, they come across a motel that offers one in every room. They meet Muddy Grimes, who thinks they're hired hitmen and offers them $10,000 to "do" his wife Dallas in
Las Vegas. Thinking that "do" means have sex, Butt-Head convinces Beavis that they can finally "
score" and buy a new TV. Muddy drives the boys to the airport. In Las Vegas, Beavis and Butt-Head arrive at their hotel room, but Dallas catches them eavesdropping and holds them at gunpoint. The boys refuse Dallas's offer of $20,000 to "do" Muddy and argue over who will "do" Dallas first. Realizing that Beavis and Butt-Head have misunderstood their instructions, she plants the X-5 unit, a stolen
biological weapon, in Beavis's shorts. She tells them to meet her at the
U.S. Capitol. Beavis and Butt-Head board a tour bus. After they accidentally sabotage the
Hoover Dam, Agent Flemming of the
ATF becomes convinced that they are criminal masterminds and places them on the
FBI's most-wanted list. At
Yellowstone National Park, Beavis and Butt-Head accidentally board a bus full of nuns who are repulsed by the boys and abandon them in
Petrified Forest National Park. After walking through the desert, the boys meet two former
Mötley Crüe roadies, unaware that they are their biological fathers. Muddy returns to the motel, meets the real hitmen, and angrily swears to track down and kill Beavis, Butt-Head, and Dallas. The hitmen, who stole Beavis and Butt-Head's TV, abandon it in front of the motel. Beavis and Butt-Head awaken to find the drifters gone and continue walking until they become dehydrated and weak, they start to see
their lives flash before their eyes, with Butthead reminiscing on him and Beavis growing up together while Beavis sees himself as a
sperm cell going inside an
ovum. While suffering dehydration, Beavis takes a bite out of a
peyote cactus, causing him to have hallucinations. Muddy finds Beavis and Butt-Head. After learning that Dallas intends to meet them, he puts them in his trunk and drives on. In
Virginia, they jump out onto the interstate and cause a 400-car
pileup. They walk past the scene and get back on the tour bus, stopping at the Capitol before reaching the
White House. Muddy captures Dallas in a parking garage before she can meet Beavis and Butt-Head, but she is able to distract him with seduction and they have sex in his car, resulting in them being found and arrested by ATF. The ATF is dispatched to the White House because Beavis and Butt-Head are there on the same day as a peace conference. Beavis transforms into his alter-ego
Cornholio after consuming caffeine and sugar. Wandering into the
Oval Office, he picks up the
red phone, causing a military alert. Meanwhile, Butt-Head attempts to seduce
Chelsea Clinton, but is thrown out of her bedroom window before he is detained and cavity-searched by ATF officers. Beavis goes to their neighbor Tom Anderson's travel trailer, where Anderson catches him masturbating and throws him out. The ATF, thinking Beavis has the X-5 Unit, are about to open fire when Anderson throws out Beavis's shorts. The shorts are ripped, and the X-5 Unit flies into Butt-Head's hand, and he casually gives it to Flemming. Anderson is falsely accused of trying to frame Beavis and Butt-Head for his own crime and is arrested along with Dallas and Muddy while his wife is taken for a cavity search. Flemming proclaims Beavis and Butt-Head heroes, and they meet President
Bill Clinton, who makes them honorary ATF agents. Beavis and Butt-Head return to Highland, upset that they did not have sex or receive money, but they find their TV at the motel and walk into the sunset carrying it back home. == Voice cast ==