The Dominators will be the main villains of the four-part Arrowverse mega crossover.
The crossover will apparently take influences from the Invasion! crossover of the 1980's.
"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," said Arrow and DC's Legends of Tomorrow executive producer Marc Guggenheim. "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.”
I wonder if this is going to end up bringing in the Arrowverse Legion or Green Lantern Corps.?