"Toto, I've a feeling we're not in KansasA landlocked state in the midwestern USA. anymore!" Dorothy, played by Judy GarlandAn American actress and singer who was born in 1922 and died in 1969. She achieved international stardom. , has just arrived in the Land of Oz. It is a colourful dreamland, with roads of yellow bricks and tall green vines.

It is one of the most famous movie moments of all time. Now Wicked, a new spinoffA product, such as a new film or TV show, that originated from an existing product. of The Wizard of Oz, is expected to be a huge film hit this winter. The UK will see its cinema release today.

But is there more to the film than bright colours and sequins? Here are four key themes that suggest the film has a moralConcerned with what is right and wrong. message:

Sacred sisterhood. The central theme of Wicked is the relationship between two opposites: glitzy Glinda and outsider Elphaba. The girls become friends, but are torn apart.

Vice and virtue. Elphaba, a misunderstood outcastA person who has been rejected or thrown out by society. with bright green skin, was written as the villainAn evil person in a book or film. of The Wonderful Wizard of Oz. But Wicked suggests that she is just misunderstood.

Power and repression. Abuse of power is a major theme in Wicked. The Wizard uses his secret police to crush everyone's rights.

Blind hatred. Elphaba faces discriminationWhen people are treated unfairly due to characteristics such as gender, race and age. throughout her life. Her green skin marks her as different to others, and means they are less likely to take her seriously.

Does the movie have an important message?

Yes! There are many important themes in Wicked, from friendship to serious debates about how power and control work.

No! Wicked has been marketed mostly to children. Its themes will not go beyond a simple story of the difference between "right" and "wrong".