It’s not yet clear what happened to Ronnie Raymond (Robbie Amell) after the doors to the particle accelerator were closed. However, we do know for a fact that he will be appearing in The Flash as the nuclear superhero Firestorm. Yesterday, via Instagram, Amell posted a photo from the set of The Flash , posing as an slightly burned Ronnie Raymond alongside Victor Garber who will be portraying Dr. Martin Stein. (See Below)
There’s still much mystery shrouding Firestorm. Especially how Ronnie and Dr. Stein will end up meeting and eventually transform into Firestorm. But considering this show is a spin-off of the hit television show Arrow, it’s highly likely all will be revealed in the frequently occurring “Flash”-blacks.
Source(s): Comic Book Movie