Coldwave

Coldwave is the slash ship between Leonard Snart and Mick Rory from The Flash and Legends of Tomorrow.

Pre-Canon
Mick and Leonard first met in Juvie when several older kids were beating up a 14 year old Leonard. One pulls out a shiv but Mick stops them, beating them up. They've been friends ever since.

Mick and Leonard were working a job, before the particle accelerator explosion. The job went wrong and half of Mick body was burned. This caused a falling out between the two.

Episode 4: Going Rogue
When looking fro new equipment to go up against The Flash, a janitor from S.T.A.R. Labs offers to sell Leonard first a flamethrower, then a cold gun.

After Leonard goes up against The Flash, he tracks down his old partner, Mick, with an offer. He tells Mick that he needs to step up his game and in order to that, he need his partner back. He gives Mick the flamethrower, and Mick says he's in.

Fandom
AO3

FANFIC
 * coldwave

TUMBLR

Trivia

 * The ship name comes from the second half of Leonard's codename, Captain Cold and the second half of Mick's codename, Heatwave.
 * Their actors, Wentworth Miller and Dominic Purcell, played brothers on Prison Break. They're also best friends.