Prometheus is returning to the 4-series crossover, Crisis on Earth-X… but according to EW.com, there are no plans for Josh Segarra to return for the role. It looks like the second archer on the bad guy side from the preview art is Prometheus-X, along with Dark Archer, Dark Flash and Overgirl. Segarra played Adrian Chase aks Prometheus in season 5 of Arrow and died by his own hand at the end of the season.
Which leaves the question, who is Prometheus on Earth-X? Is it a situation like some of the times Deathstroke popped up previously and they just didn't take off the mask. Or will the story involved someone else from that world taking up the mantle. There has been talk about Colton Haynes returning to the series. The former Roy Harper / Arsenal actor posted to social media that he would be back soon. It might also be someone who was briefly hinted at being Prometheus last season, Paul Blackthorne. There was an episode where they made it look like Quentin Lance could be blacking out from drinking and becoming the villain… but they moved past that quickly.
We expect Melissa Benoist, Stephen Amell and Grant Gustin to play the evil versions of their characters… but you never know. Russell Tovey has been cast as The Ray and is expected to provide the voice for the character in the animated series as well.
The four-part crossover will air starting Monday November 27th for two hours (Supergirl and Arrow) and then conclude on Tuesday November 28th for two hours (Flash and Legends of Tomorrow). The series should begin production on their portion of the crossovers shortly. Any other casting new should come shortly.