A new fantasy drama kicks off on E4 tonight which takes place 40 years after aliens crash-landed in the UK. Forced to live a segregated life, the aliens live behind a huge wall in a ghetto called Troy. Border guard Lewis's life is thrown into turmoil after an encounter with mysterious alien Lilyhot, when he discovers he is actually half alien himself, and things spiral out of control when his sister Holly becomes embroiled with an alien drug gang and is kidnapped and taken into Troy. Sounds totally bizarre but so does the premise of some of the best shows in fairness.