When is the Supergirl/The Flash/Arrow/DC’s Legend's of Tomorrow crossover on Sky1 ?

An exciting early Christmas present for comic-book fans is on its way: the highly anticipated four-way crossover event between Supergirl, The Flash, Arrow and DC’s Legends of Tomorrow.

Superheroes from all four series will unite against a deadly adversary known as the Dominators in an action-packed special episode. Gunning for the death of all metahumans, the Dominators perceive the DC heroes as threats to the alien race, setting the scene for an explosive multi-universe skirmish. 

Catch it Monday 12 and Thursday 15 December at 20.00 on Sky 1 & NOW TV