S2, E7: After learning the Dominators’ plan for the world, the Legends must work together with The Flash (guest star GRANT GUSTIN), Supergirl (guest star MELISSA BENOIST) and Green Arrow (guest star STEPHEN AMELL) to kill them once and for all. Meanwhile, Stein figures out, with the help of others, how the team can terminate the Dominators, but is distracted by the aberration he realizes he created in 1987. It’s all for one and one for all in the epic conclusion of the three-part Super Hero Crossover event!