“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.
The episode is described as: “Oliver and the recruits take on a new threat with help from The Flash (guest star Grant Gustin) and Supergirl (guest star Melissa Benoist).”
The CW‘s Invasion crossover continues tonight with the Arrow chapter of the event (the 100th episode of Arrow!) and the first promo for the episode has debuted online!