Leonard Snart

Leonard Snart, also known as Captain Cold, is a fictional criminal featured in the shared continuity of the DC Television Universe. Played by actor Wentworth Miller, he first appeared on the second live-action The Flash television series in 2014 in the season one episode titled, "Going Rogue". He made four appearances in season one, and another four in season two before branching off to become a series regular on the spin-off program, Legends of Tomorrow.