US TV network CW has released the first trailer for the highly anticipated DC's Legends of Tomorrow, which will première January 21.  In an action-packed trailer we see time-traveller Rip Turner, played by the excellent Arthur Darvill, gather together a bunch of superheroes and villains to save the world from a potentially horrible future.  The cast includes former Superman Brandon Routh, and former prison breakers Wentworth Miller and Dominic Purcell.