CW’s Firestorm gets a new power, but it is still unclear who will play Firestorm in The Flash spin-off series Legends of Tomorrow.. Robbie Amell played half of the superhero known as Firestorm in The Flash’s smash first season. Firestorm’s other half was played by Victor Garber (Alias). The first season of the The Flash ended with a fantastic cliffhanger involving the Firestorm character, but we didn’t see everything originally planed.  In an interview with SCREENRANT, Robbie Amell tells us a bit of what was edited out for the finale:
“The sad thing is there was a moment in the finale that had to be cut out – just because it was such a massive episode and it didn’t actually have anything to do with plot – where they introduced matter manipulation. There’s a scene where Danielle [Panabaker]’s character is checking my temperature and giving me the once-over. I call Victor in the room and we merge, and I turn her thermometer into a daffodil. It was just like a really nice, sweet way of showing… because she’s asking if we’re going to be OK, and I’m like, “Actually, we’re getting pretty good at this whole Firestorm thing.” And we merge without even missing a beat and turn that into a flower. It was a nice moment, but ultimately it just didn’t hold any bearing on the plot.
“So, matter manipulation I’m sure will be reintroduced, or maybe it will be available on the DVD director’s cut of the episode. But there’s so much they can do with this character. My biggest fear with the character was that he was too powerful. I think that sometimes that can be an issue. I feel like that’s the only problem I ever have with the Superman comic book, is other than kryptonite, how do you stop this guy? But they’ve done an unbelievable job.”
In the comics, Firestorm has the ability to rearrange the atomic and subatomic structure of inorganic matter, rearranging subatomic particles to create objects of different atomic characteristics of equal mass.  He can rearrange organic matter as well, but at a potentially lethal cost. This is a very different and promising character for the CW to explore. There is a lot of potential but also a lot of uncertainty.
Here is what we know: Robbie Amell will reprise his role as Firestorm in the first episode of The Flash season 2. He is not, however, confirmed as a cast member of Legends of Tomorrow, although his other half, Victor Garber is.  The promotions tease Amell’s possible involvement, but the actor has been conspicuously  from the Legends of Tomorrow trailer.  Amell won’t say for sure, though the Legends of Tomorrow Twitter seems to embrace the actor:
#TheFlash‘s @RobbieAmell Talks S2 and #LegendsOfTomorrow! http://t.co/nlACqvgRPx#Firestorm#RonnieRaymondpic.twitter.com/1T1rO7C3bO
— Legends of Tomorrow (@Legends_Podcast) June 9, 2015
More updates to follow as they become available.