The Solar Opposites do a sequel to their first Halloween special.
Michelle and Allen, who have reached the point in their relationship where they are considering next steps, decide to invite their parents to finally meet and to offer some understanding of why marriage works. Except the parents already know each other quite well, which leads to some very distinct opinions about the value of marriage.
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.