Guggenheim said that it was just a one-off deal which came out as a result of the previous discussion of a crossover between “Constantine” and “Arrow.” But since “Constantine” has already been cancelled, Ryan and Stephen Amell pushed through with the deal just the same for one time.
The rumors of the possible return of John Constantine on “Arrow” started when the episode that featured his character was well-received by fans and critics alike, even recording an 11% jump in the ratings of “Arrow” during that November 4 episode.
It’s water under the bridge now but “Constantine” would have been in the second half of its supposed Season 2 by this time on NBC had the show not been cancelled in May last year, just weeks after its Season 1 finale.
Apart from the fact that the show was actually in the wrong channel, “Constantine” executive producer David Goyer explained that the TV series, although a DC Comics lore, has not been given the right promotions by the network.
Goyer cited the half-hearted acceptance of NBC to the TV series because the network is no longer as dominant as in the past years, which is why “Constantine” only received a token promotion during its 13-episode Season 1 run.