Lucia Walters

This special crossover episode sees Supergirl, The Flash, Green Arrow and DC's Legends of Tomorrow unite against an alien race called the Dominators.

As Michael, Lincoln and the remaining Ogygia gang try to escape Yemen, they find themselves racing through the desert from a vengeful Cyclops.

The agents investigate circumstances surrounding a man's death after his body disappears from the morgue.

Nathan does all he can to safeguard Mara from the wrath of the townspeople. Dwight and Duke, meanwhile, have a deadly new Trouble to contend with.

Nathan and Dwight lock horns over the problem of Mara. While Dwight wants Mara to end the Troubles, Nathan still hopes to save Audrey.