<Li> Robbie Amell portrays Ronnie Raymond / Firestorm , an engineer at S.T.A.R. Labs and Caitlin Snow 's fiance ' , based on the DC Comics character of the same name who is half of the character Firestorm . He is thought to be dead in the particle accelerator explosion , saving the lives of his co-workers . He survived the accident , which merged him with Martin Stein and the F.I.R.E.S.T.O.R.M. transmutation matrix , transforming both of them into one pyrokinetic entity . Though Firestorm is Ronnie 's body , it is Stein who remains in control for most of their existence , with Ronnie occasionally taking control for brief moments . They eventually learn to control their shared powers , including an ability to separate themselves at will . Like Caitlin , Cisco and Stein , Ronnie also becomes good friends with Barry Allen ; he and Barry ultimately join forces with Oliver Queen to subdue the Reverse - Flash . Ronnie marries Caitlin , though he is presumed dead when he sacrifices himself to stop the singularity above Central City , giving a final goodbye to Caitlin . <Ul> <Li> Amell also portrays the Earth - 2 version of the character , Ronnie Raymond / Deathstorm , who is Killer Frost 's husband . He works for Zoom alongside Killer Frost and Reverb . Ronnie is killed by Zoom for harming the Flash . </Li> </Ul> </Li>
<Li> Robbie Amell portrays Ronnie Raymond / Firestorm , an engineer at S.T.A.R. Labs and Caitlin Snow 's fiance ' , based on the DC Comics character of the same name who is half of the character Firestorm . He is thought to be dead in the particle accelerator explosion , saving the lives of his co-workers . He survived the accident , which merged him with Martin Stein and the F.I.R.E.S.T.O.R.M. transmutation matrix , transforming both of them into one pyrokinetic entity . Though Firestorm is Ronnie 's body , it is Stein who remains in control for most of their existence , with Ronnie occasionally taking control for brief moments . They eventually learn to control their shared powers , including an ability to separate themselves at will . Like Caitlin , Cisco and Stein , Ronnie also becomes good friends with Barry Allen ; he and Barry ultimately join forces with Oliver Queen to subdue the Reverse - Flash . Ronnie marries Caitlin , though he is presumed dead when he sacrifices himself to stop the singularity above Central City , giving a final goodbye to Caitlin . <Ul> <Li> Amell also portrays the Earth - 2 version of the character , Ronnie Raymond / Deathstorm , who is Killer Frost 's husband . He works for Zoom alongside Killer Frost and Reverb . Ronnie is killed by Zoom for harming the Flash . </Li> </Ul> </Li>
who plays caitlin 's fiance in the flash
who plays caitlin 's fiance in the flash
Robbie Amell
Robbie Amell