The Arrowverse midseason return trailer includes a cameo by The CW’s latest DC superhero addition, Black Lightning (Cress Williams).
Black Lightning was originally setup at FOX and developed for the network, before The CW ordered its pilot instead and eventually picked it up to series.
Black Lightning won’t be part of the Arrowverse when its freshman season premieres next week, even though Arrowverse co-creator and chief architect Greg Berlanti is among the executive producers on the series.
Supergirl then moved to The CW for its second season and has been firmly part of The CW superhero family since then.