The music of Wyld Stallyns has created a utopian future society. In the year 2691, former gym teacher turned terrorist Chuck De Nomolos attacks the Bill & Ted University and steals a time-traveling phone booth, intending to alter the history of what he considers to be a foolish and frivolous society by sending evil robot replicas of Bill and Ted back to the late 20th century to prevent the originals from winning the San Dimas Battle of the Bands. Rufus attempts to stop De Nomolos but seemingly becomes lost in the circuits of time.
In the present, Wyld Stallyns are auditioning for an upcoming Battle of the Bands. Though Bill and Ted's current girlfriends and former 15th-century princesses Joanna and Elizabeth have become skilled musicians, the duo themselves are still inept. Despite this, the organizer Ms. Wardroe assures them a slot in the contest as the final act and informs them that victory will result in a record deal and $25,000 prize money. Following a party, the duo proposes to their girlfriends just as the evil robots arrive from the future. After luring the human duo away to Vasquez Rocks and killing them by throwing them over the side of a cliff, the robots begin working to ruin Bill and Ted's eventual fame along with their relationships with their fiancées.
In the afterlife, Bill and Ted's souls are met by Death who says they may challenge him in a game for their souls, but warns that nobody has ever won. Bill and Ted escape after giving Death a "melvin". Attempts to contact the police by possessing Ted's father and a deputy fail and their next attempt for help at a séance held by Missy ends with them being sent to Hell. Tormented by Satan and forced to face their own fears, the duo realize their only escape is to take Death's offer; he then appears and allows them to choose a game. To Death's dismay, they select modern games like Battleship, Clue, Electric Football and Twister, beating him every time. Finally, he reluctantly concedes, placing himself at their command.
Realizing they need to build good robots to counter De Nomolos's evil robots, Death escorts the pair to Heaven. God directs the group to an alien duo named "Station", who readily agree to help them. On the eve of the Battle of the Bands, Bill and Ted are brought back to life. Having obtained supplies from the Builders Emporium store, the two Stations run at each other, merging to form a single giant being who constructs the benevolent robot versions of Bill and Ted in the back of the van as they race back to the concert. Elsewhere, the evil robots abduct the girls and tie them high above the stage at the Battle of the Bands, intending to drop them to their deaths at the finale.
Bill and Ted arrive just as the evil robots take the stage; the benevolent Good Robots easily defeat their evil counterparts and Joanna and Elizabeth are lowered by Station before their ropes break. De Nomolos appears in the time booth, preparing to kill Bill and Ted himself, and overrides the broadcasting equipment to send a live feed of their confrontation across the entire planet. Bill and Ted deduce that they can go back in time following the encounter to arrange events for De Nomolos to be captured in the present; though De Nomolos attempts to follow suit, the duo turn the tables by explaining that only the winners get to go back. After De Nomolos is "melvined" by Death and arrested by Ted's father Captain Logan, Ms. Wardroe reveals herself to be a disguised Rufus, who gives them the stage.
Acknowledging their ineptness, the duo decide to use the time booth; they immediately return to the auditorium with their families, which now include young children, after sixteen months of intense guitar training and a two-week honeymoon. Joined by Death, the Stations, and the good robots on stage, Wyld Stallyns perform a stunning rock ballad as De Nomolos's broadcast continues, broadcasting their music worldwide and creating harmony.
During the credits, newspaper and magazine covers show the victorious Wyld Stallyns encountering many perks of fame that help them to fulfill their destinies and create their utopian society with their music, eventually taking their act to Mars.
On review aggregator Rotten Tomatoes, 56% of 54 critics gave Bogus Journey a positive review, with an average rating of 5.90/10. The website's critics consensus reads "Bill & Ted's Bogus Journey has the same stars—and cheerfully wacky sense of humor—as its predecessor, but they prove a far less effective combination the second time around." Metacritic assigned the film a weighted average score of 61 out of 100, based on 10 critics, indicating "generally favorable" reviews. Audiences polled by CinemaScore gave the film an average grade of "B+" on an A+ to F scale.
