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In 2020, Bill and Ted have failed to write a prophesied song to unite the world.[a] Their marriages and careers are deteriorating, and time and space are beginning to collapse.

Kelly, the daughter of Bill and Ted's deceased time-travelling guide Rufus, arrives to take them to the year 2720 in San Dimas, California. Her mother, the Great Leader, tells them that they have until 7:17 p.m. that night to create the song or reality will collapse. They use Rufus' time-traveling phone booth to retrieve the song from their future selves. They discover their future selves have failed; their wives have left them and they blame their past selves for their failures.

An impatient Great Leader sends a time-traveling robot, Dennis, to kill them, hoping that it will stabilize reality. Kelly travels back to the present to warn them, but instead meets their daughters, Billie and Theadora (Thea), who decide to help make the song. Using Kelly's time machine, Thea and Billie recruit musicians Jimi Hendrix, Louis Armstrong, Wolfgang Amadeus Mozart, Ling Lun and Grom, a prehistoric drummer. Thea, Billie and their band return to the present to meet up with Kelly and a time-displaced Kid Cudi but Dennis inadvertently kills them and sends them to Hell.