In the year 2688, humanity thrives in a harmonious society, largely thanks to the profound influence of the music and philosophies of the Two Great Ones: William "Bill" S. Preston, Esq. and Ted Theodore Logan. Amidst this utopia, a citizen named Rufus is entrusted by the community's leaders with an important mission: to travel back to San Dimas, California, in 1988 using a time machine that resembles a phone booth. His task is monumental—he must ensure that the young Bill and Ted, who are not the brightest high school students, manage to pass their history class. Failure to do so would result in dire consequences for Ted, as his father, Captain Logan, intends to send him off to a military school in Alaska, thereby dismantling their burgeoning band, Wyld Stallyns, and irrevocably changing the course of history.
Rufus’s journey leads him to a Circle K convenience store where he discovers Bill and Ted, caught up in their struggle to complete a history report crucial for their class. They are required to articulate how historical figures might perceive modern-day San Dimas. After some initial hesitation, Rufus offers his assistance, and shortly thereafter, a future version of Bill and Ted appears from another time machine, confidently assuring their younger selves of Rufus’s authenticity before they all vanish.
Rufus proves to be an invaluable ally, teaching Bill and Ted the mechanics of the time machine and whisking them away to 1805, where they meet a commanding Napoleon Bonaparte. However, a cannonball explosion throws Napoleon into chaos, and in a twist of fate, he inadvertently travels back to the present with them. Rufus then emphasizes the urgency of their mission: they cannot afford to miss their presentation the next day. Left alone with the now-empty time booth, the two teens craft a plan to gather exemplary historical figures for their presentation, leading them to the unexpected predicament of Napoleon, who finds himself trapped in a tree.
Their escapades take them from befriending Billy the Kid in the Wild West to meeting Socrates in Ancient Greece and even charming princesses Joanna and Elizabeth in 15th-century England. But their romantic pursuits quickly turn perilous when the king, incensed by their presence, orders their execution. Fortunately, with the help of Billy and Socrates, they manage to escape. A detour into the far future unveils a society that venerates them and their forthcoming band, inspiring them to seize a diverse array of figures for their report, including Sigmund Freud, Ludwig van Beethoven, Joan of Arc, Genghis Khan, and Abraham Lincoln. After a quick stop in the prehistoric era to fix the time machine, they intend to return to the present but instead end up back outside the Circle K, just the night before their original visit.
Upon confronting their previous selves and instilling trust in Rufus’s intentions, they learn how to navigate their time-sensitive predicament. The next day unfolds with chaos as they discover Napoleon abandoned at a bowling alley by Ted’s younger brother Deacon. Having left the historical figures to explore the local mall, Bill and Ted embark on an urgent quest to rescue Napoleon at Waterloo, a local water park. Meanwhile, their historical companions find themselves in hot water, resulting in an arrest by Captain Logan.
With a combination of ingenuity and teamwork, Bill and Ted orchestrate an elaborate escape plan utilizing the time booth to facilitate their efforts in the present. They successfully liberate their historical friends and put on a spectacular presentation at school, complete with dazzling stage effects and electrifying music, ultimately earning themselves a standing ovation and the grade they desperately needed.
In an exhilarating finale, Rufus returns with the two princesses, whom he managed to save from unwelcome fates. Not only do the princesses join Wyld Stallyns, but their collective dreams of transforming the world through music are ignited. As the group prepares to jam together, Rufus turns to the audience, reassuring them with humor, “They do get better.”
