Mill Valley, Pennsylvania, Halloween night, 1968. After playing a joke on a school bully, Stella and her friends decide to sneak into a supposedly haunted house that once belonged to the powerful Bellows family, unleashing dark forces that they will be unable to control.
Yet to fulfil their rock and roll destiny, now middle-aged best friends Bill and Ted set out on a new adventure when a visitor from the future warns them that only their song can save life as we know it. Along the way, they are helped by their daughters, a new batch of historical figures and a few music legends — to seek the song that will set their world right and bring harmony to the universe.
