A priceless relic is stolen from identical royals Queen Margaret and Princess Stacy, who enlist the help of their sketchy look-alike cousin Fiona Pembroke to retrieve it.

In the town of Dillford, humans, vampires and zombies were all living in peace - until the alien apocalypse arrived. Now three teenagers-one human, one vampire, and one zombie-have to team up to figure out how to get rid of the visitors.