We’ve got another brief glimpse at the big crossover between Arrow, Flash, Supergirl, and Legends of Tomorrow, and unsurprisingly it is filled with the delights these shows have become known for. But it also gives us our first look at the big bad guys the heroes will be teaming up against: DC’s Dominators.
Source: io9 – New DC/CW Crossover Trailer Reveals the Alien Menace, a Returning Foe, and More