What’s so great about Robbie is that he’s such a wonderful actor, it made [the chemistry] innate with us. I adore him, and we have such a great chemistry just as people. So hopefully that comes across when you first see [Caitlin and Ronnie]. There is so much love there and so much happiness. You begin to understand why she’s a sad scientist these days.

Meet Ronnie Raymond (Things You Can’t Outrun sneak peek)

The Flash is about to return to the scene of the crime.

During Tuesday’s episode, viewers will get a new glimpse at the particle accelerator explosion that turned Barry Allen (Grant Gustin) into the fastest man alive. This time, we’ll see it from a different perspective via those working at S.T.A.R. Labs, a.k.a. Ground Zero. But Barry certainly wasn’t the only one affected by the incident, as Caitlin Snow (Danielle Panabaker) lost her fiance Ronnie Raymond (Robbie Amell) as a result.

“It really gives you a chance to see the celebratory atmosphere and the excitement of the moment before the particle accelerator explodes, when everyone is rejoicing in this amazing moment that’s going to change the world,” Panabaker tells EW from the Vancouver set. “One of the best parts for me is you get to see Caitlin with Ronnie. When he died in the particle accelerator explosion, it was obviously very difficult for her. It’s nice to see the before and the love and the hope and the chemistry between these two characters so you understand why she’s so devastated when he’s gone.”

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