Captain Cold is one of the Blind Bag characters in LEGO Dimensions 2: The Rise of Enoch, from the DC Comics franchise.
In the comics, after Leonard Snart's grandfather died, he left home and worked with a small gang of thieves. After he was captured by the Flash during a robbery, he swore revenge in prison and figured a way to defeat the Flash. He created a cold gun that can lower temperatures to absolute zero and slow everything down. Upon this, he titled himself "Captain Cold" and eventually become the leader of the Rogues against the The Flash, becoming his arch-enemy.