Invasion! DC Crossover TV Event

When aliens called the Dominators attack Central City, Barry asks for help from the Green Arrow, the Legends of Tomorrow and Supergirl in the first part of the epic crossover event.

In the 100th episode and second part of the epic Crossover, Oliver finds himself in a life where he never became the Green Arrow. Meanwhile, The Flash and Supergirl help out.

After learning the Dominators’ plan for the world, the Legends must work together with The Flash, Supergirl and Green Arrow to kill them once and for all.