- “Cait, Barry was right: the world's different now. Look, I thought we could get away, start a new life; a normal life, together, but there is no normal life for us. You will always risk your life to try and help people; I will always be the guy that runs into that pipeline for you”
- — Ronnie realising their new destinies
Caitlin and Ronnie meet in S.T.A.R. Labs, where they both work, and in January 2012 begin an opposites attract romance, as Caitlin relays it to Barry. Ronnie is a very sweet, kind, outgoing and adventurous person, while Caitlin is equally sweet and kind, but of a more quiet and cautious nature. With unlikely direction from Hartley Rathaway, Cisco discovers that Ronnie is still alive and has merged with Professor Stein as Firestorm, their union unstable and subject to a nuclear explosion. Firestorm attempts to sacrifice themselves, but are saved by the Quantum Splicer which separates them and Caitlin and Ronnie finally reunite.
After 14 months of chaotic living, Ronnie asks Caitlin to leave Central City with him and start their life together anew, but Caitlin wants to remain in Central City to help people with Team Flash. After realizing that he and Professor Stein are bound permanently by a physiological and psychological connection, Ronnie tells Caitlin that he now understands their lives are altered forever. To research their condition and keep everyone safe from Gen. Eilling, Ronnie and Stein leave Central City to figure out their lives together as Firestorm. They return to help the team capture the Reverse-Flash. Ronnie re-proposes to Caitlin, who accepts and Professor Stein officiates their wedding. They are happily married, but when Firestorm helps Barry close the portal to other dimensions, Ronnie is killed.
Six months after his death, Caitlin works at Mercury Labs as she blames herself for Ronnie's death and couldn't face being in S.T.A.R. Labs day in, day out, being reminded of it. Caitlin tells Barry she thinks that if she'd gone out of town with Ronnie when he asked, he would still be alive. But Ronnie was actually the one who said that they're lives had changed and wanted to leave with Stein so Eilling couldn't harm Caitlin. After Barry and Caitlin talk, she is willing to rejoin Team Flash and start anew.
When Barry and Cisco pay Earth-2 a visit, they come across Caitlin and Ronnie's doppelgängers, who are evil – Killer Frost and Deathstorm. Although evil, the two still display affinity for one another and Killer Frost is livid when Deathstorm is killed.
- “You guys are like 10 seasons of Ross and Rachel, but just, like, smushed into one year”
- — Cisco to Caitlin
- “I used to play this game, in my head. What would I give up, for just one more minute with him: my house, my career... the rest of my life?”
- — Caitlin to Cisco
This section is in need of major improvement. Please help improve this article by editing it.
On AO3, SnowStorm is the most written ship for Ronnie and the fourth most written for Caitlin.
|SHIPS||slash||Coldflash • ColdRay • Coldwave • Hartmon • Olivarry|
|femslash||Agent Frost • Batfrost • Caitlicity|
Frostdrake • Smoakwest • Supersnow • Westpark
|het||Barricity • Cynco • Goldenvibe • Hawkvibe • Irisco • Killervibe • Laurisco|
Quickwest • Smoakvibe • Snowatom • Snowbarry • SnowStorm
SuperFlash • Supervibe • Theallen • Westallen • Westhawne
|CHARACTERS||female||Caitlin Snow • Iris West|
|male||Barry Allen • Cisco Ramon • Mick Rory|