“[It is] an opportunity for us to see Laurel Lance and Ray Palmer as Black Canary and The Atom.
Black Canary’s Earth-2 doppelganger, Black Siren, appeared in season 2 of The Flash.
Green Arrow (Stephen Amell) and The Flash (Grant Gustin) appeared in the show during season 1, and Vixen is now joined by several more familiar faces in season 2.
Since the new episodes of Vixen take place in an earlier timeline than the current season of Arrow, viewers have been treated to an appearance by Black Canary, a.k.a.