I love the announced title of episode 4.04, which presumaby introduces Ralph Dibny: "Elongated Journey Into Night." 

Battlestar Galactica alum Katee Sackhoff is set to recur on The CW’s The Flash, as the DC Comics villain Amunet Black aka Blacksmith.
Just going by the title "Girls Night Out" sounds like it will be really good or really terrible.
Have they cast Ray already?
The Ray? Earth-X? So it's not just a crossover with all four live-action shows, but with the upcoming Freedom Fighters: The Ray animated webseries? Cool!
And there will be lots of superheroes punching Nazis. How timely.
EDIT: More info:
http://www.cbr.com/arrowverse-2017-crossover-details/
The logline is, “With all of the heroes in town to celebrate Barry and Iris’s wedding, villains from Earth-X crash the festivities with a deadly agenda.” That's a nice way of setting up a crossover among all the heroes, and one that has lots of comic-book precedent going back to Reed and Sue's wedding in The Fantastic Four.
The mock cover is by Phil Jimenez and homages the cover to Justice League of America #207. Note that Firestorm is in the same position on both covers, and Supergirl is in place of Power Girl. Oddly, Steel was on the original cover but Vixen is in his place here.
And equally odd (unless I missed an earlier post), no one is talking about who Zari is, in place of Zantanna. Who is she? WHat's her power/role?
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