[Watch] Deathstroke revealed for Flash, Arrow, Legends of Tomorrow and Supergirl crossover trailer

The CW has released the first trailer for their upcoming mega-crossover with Arrow, The Flash, Legends of Tomorrow and Supergirl. It's our first glimpse at the aliens invading Earth and also reveals Deathstroke, although we're not sure how he exactly fits into the crossover.

The aliens involved are the Dominators, which were the ones from the comic series that attempted to decimate the Earth and its inhabitants. It will be a four night, back to back event starting on Monday, November 28th with Supergirl. The Flash is on Tuesday followed by Arrow and Legends of Tomorrow. Each show airs at 8 PM est.

Executive Producer Marc Guggenhim was excited about the crossover, saying "This year, for our mega 'Arrowverse' crossover, we’re taking inspiration from a DC crossover from the late 1980s known as Invasion!, which featured an alien race called the Dominators, who’d previously vexed the Legion of Superheroes. We’re using cutting edge prosthetics and computer effects to achieve a feature film-quality look which is faithful to Invasion! artist Todd McFarlane’s interpretation of the characters.”

It all starts in less than two weeks on the CW, November 28th at 8 PM est.