The CW has been building and expanding its DC Comics-inspired universe ever since Arrow debuted on the network in 2012.
Now, The CW is reviving Constantine – sort of.
Another character officially inducted into canon is Matt Ryan’s John Constantine, who originally appeared in the NBC series, Constantine, although it only ran for one season before being cancelled by the network.
However, perhaps the most interesting case is Supergirl relocating to The CW for its second season after initially debuting on CBS; now, the Girl of Steel is an official member of the DC TV universe.