The story begins three hundred years into the future, when the company Global Soft has taken over the world, now known as Planet Mall. Only digitally produced music is allowed and all live music has been outlawed. The head of Global Soft is businesswoman Killer Queen, who is served by the Secret Police and their chief, Khashoggi.
The Gaga kids download their fun from the internet and live in a consumerist world of constant commercials. Galileo and Scaramouche don't fit in with the Gaga kids and they try to rebel, but their rebellion is noticed. They are both captured by the Secret Police. The two meet for the first time in hospital, only to escape and go on the run together.
A band of rebels, called the Bohemians, are attempting to rediscover the music of the past but their only evidence is scraps of old books and posters and their only instruments are made from junk. They have formed a base in a disused tube station and are collecting anything they can find in their search to recreate the music of the past, a time known as 'The Rhapsody'.
The Bohemians are waiting for someone who remembers the old music to show them a way of finding the instruments which the rock group Queen hid hundreds of years ago. They have taken the names of past heroes, such as Paul McCartney, Cliff Richard, Meat Loaf, Britney and even Bob the Builder.
Scaramouche and Galileo find the Bohemians, but what they don't know is that they have been fitted with tracking devices in hospital. The Secret Police follow them and the Bohemians are captured. Their leader, Britney, is killed in the raid. The Bohemians are sent to the Seven Seas of Rhye, where their minds are lost.
An old librarian, Pop, who has read the secret texts has also been captured. Scaramouche and Galileo find the Seven Seas and discover that Pop, who is working in a bar, has not forgotten all that he learned from the old texts. With his help Galileo remembers the words that will lead them to the place of heroes.
Luckily, because more water is required to fill the giant fizzy drink vending machines on Planet Mall, the water near the Seven Seas of Rhye recedes, revealing a statue of Freddie Mercury, which points the way to Wembley Stadium.
Galileo releases the instruments from the ruined towers and the Bohemians are saved.