Supergirl, “Nevertheless, She Persisted:” Through alien invasion, a temporarily mind-controlled super-cousin, an anti-alien weapons, the departure of her gratuitous super-boyfriend, and a teaser for next year’s big bad.
The Flash, “Finish Line:” Much drama ensues, Iris steps up, and Barry uses a technique against Savitar that he literally could have tried several episodes ago. Then we get a depressing teaser for next season, because CW still thinks we want a dark, mopey Flash.
Arrow, “Lian Yu:” Barry comes full circle, and past characters return.
Discussion below.
Arrow: Past characters return, [spoiler]and then depart!! Merlyn blows off to Bermuda, and then everyone else dies on the island![/spoiler] it seems that the first one probably is going to stick, too.
It seems like Flash and Supergirl both basically ended the same way, but with the roles reversed, and [spoiler]made the whole Music Meister episode kind of moot.[/spoiler]