DC Comics heroes have been enjoying a successful run on The CW with Arrow, The Flash, Legends of Tomorrow, and the newly-migrated-from-CBS show, Supergirl.
Arrow and The Flash appeared in season 1 of Vixen, and were voiced by their live-action actors Stephen Amell and Grant Gustin, respectively.
It looks like the Arrowverse team-ups will continue, as you can see in the Vixen season 2 trailer above that premiered at San Diego Comic-Con.
Fans of the quartet of series learned last year that there was also another vigilante hero out there in the Arrowverse, a totem-channeling crime-fighter named Vixen.