Barry seems to mediate as Caitlin and Ronnie chat.

Ronnie is a test subject that Caitlin is probably not used to.

Robbie Amell is back as Ronnie AKA Firestorm. Yay!

Caitlin knows she can count on Barry no matter the problem.

The Flash Team has a pow wow about Ronnie. Just a hunch.

Cisco has on his thinking cap as he always does! Yep.

Is Harrison Wells attacking the problem with good or evil?

OK. He's not an enemy that he knows of, but Barry's reading about Harrison!

Victor Garber joins The Flash as Martin Stein. Welcome!

He must be the storm, right? Because Ronnie sure seems to be fire.

Joe West enlists Cisco's help to look into Nora Allen's murder.

Chase Masterson guest stars as Sherry. But who is she?

Cisco looks like a kid at Christmas with whatever he has there.

Barry rescues Caitlin in full Flash gear. Where are they?

Caitlin looks shocked. Is Ronnie there, hiding out in the snow?

It's Robbie Amell on The Flash! Sadly for Caitlin, however, his character isn't who he used to be.

Caitlin is appealing to her ex fiance. What are they talking about?

Could there be a more perfect setting for Caitlin Snow?

Barry carries Caitlin down the hillside. What has happened to her?

Barry heals easily, but does his body retain heat? Let's hope so!

Are they in the snow so they can get physical? It works!

Caitlin reaches out to the bit on Ronnie's chest. What is it?