You're a kid who wasn't out to hurt anyone. Sure, you've done your fair share of armed robbery, grand theft, destruction of property, kidnapping... But you never wanted to start a new ice age or turn people into popsicles.
~ Jake Shell to Captain Cold.
Leonard Snart, better known as Captain Cold, is one of the two secondary antagonists (along with Zoom) of the Flash comics and media. He served as one of the Flash's archenemies alongside Gorilla Grodd and Professor Zoom as one of the main antagonists of the Flash franchise mostly involving story arcs with him as the leader of his group the Rogues as the antagonists. He is the older brother of Lisa Snart (Golden Glider).
Raised by an abusive father, Leonard Snart sought to start a criminal career following the death of his grandfather. At first, he attempted simple thievery with a band of thugs. After this failed to produce satisfactory results, he went solo. During a botched robbery of a cyclotron, Snart's gun was altered by the cyclotron's radiation, allowing it fire beams of pure cold, and from time to time, cast illusions. Putting together a blue and white parka, Len became Captain Cold, one of the Flash's deadliest enemies. He is currently the leader of the Rogue's Gallery. But in the New 52, after the Crime Syndicate was defeated, Cold stopped his life of crime and became a member of the Justice League along with Lex Luthor.
In DC Rebirth, he went back into being a criminal and leading the rogues again.
Powers and Abilities
Captain Cold wields special "cold-guns" which he uses to freeze anything and everything to the core. It can even turn the moisture contained in thin air into solid ice. In the New 52, at one point after going through experiments, he gained the ability to uses these powers himself to where he could created a special freezing field to reduce the Flash's speed to human level. These powers were later removed by Deathstorm during the Forever Evil event, forcing Cold to go back to using his cold-guns.
In other media
Justice League Unlimited
He appears in the show Justice League Unlimited in the episode "Flash and Substance" where he conspires with his fellow rouges about killing the Flash. They all do bad until he decides that they should all attack him at a museum. Later they all attack Batman, Flash, and Orion. During the fight he and Captain Boomerang severely hurt and nearly kill Orion but he escapes. Eventually one of his beams ricochets onto him, freezing him and is later taken to jail. In this show he is voiced by Lex Lang.
Batman: The Brave and the Bold
He later appears in the show Batman the Brave and the Bold in the episode "Requiem for the Scarlet Speedster" where in the Flash's absence commits crimes with his fellow rouges. They then fight Batman, Kid Flash and the original Flash. In the fight he accidentally freezes Heat Wave and is defeated by the original Flash. In this show he is voiced by Steve Blum.
In the show Young Justice, Cold appeared in the episode "Independence Day" where he robs a jewelry store but is stopped by Flash and Kid Flash. He later appears in the episode "Terrors" where it is revealed that he let himself be captured to help the other ice villains in an escape attempt in Belle Reve prison which is where he is sent to. In the episode "Coldhearted" he powers an ice weather machine along with the other ice villains and later made a cameo in his prison cell. In the episode "Satisfaction" he uses a big freeze gun to freeze a bank and starts to dig it up but is attacked by Zatanna, Rocket, Batgirl, Miss Martian, Black Canary, Bumblebee, and Wonder Girl. In this show he is voiced by Alan Tudyk, who also played Ludo in Star vs. the Forces of Evil, The Duke of Weselton in Frozen, Lenny in Ice Age, Alistair Krei in Big Hero 6, Duke Weaselton in Zootopia, Van Wayne in Powerless, Iago in the 2019 remake of Aladdin, and Todd/Hushfluffles in Final Space.
Harley Quinn (TV series)
Captain Cold appear in DC Universe's adult animation series Harley Quinn.
Superman/Batman Public Enemies
In the animated movie Superman/Batman Public Enemies once again helping his fellow ice villains take down Batman and Superman and collect the bounty on them. In this movie he is voiced by Michael Gough.
In the live action show Smallville, Cold appears in the episode "Prophecy" working for Toyman. He sends him to kill Impulse.
Actor Wentworth Miller portrays Leonard Snart in the 2014 TV series The Flash and the 2016 TV series DC's Legends of Tomorrow. In the episode 'Going Rogue', he is first seen hijacking a truck, but his plan is stopped by The Flash. He is later seen with a person selling him some guns, one of which he keeps for Heat Wave. He takes a gun that can fire cold flames and kills the seller. He goes to a museum and attempts to steal a gem, but The Flash shows up. He tests his gun by shooting at people, however he only killed one.
In the videogame, Captain Cold is a member of the Society, led by Gorilla Grodd, but started out as a member of the Suicide Squad in the comic prequel.
He has a personal grudge against the former members of the Superman Regime after they killed all of his friends (Rogues), including his sister, Lisa. However, his main animosity, true to the comics, still remains towards the Flash.
In the Flash's chapter, Captain Cold confronts him alongside Deadshot. When Flash expresses his shock that Cold, of all people, would support the invasion, Cold retorts by saying that he is not going to defend the people who cheered on the death's of the Rogues including Lisa. Flash, upon defeating him notes that Cold has the right to be angry with him, even saying "I guess we both let each other down."
Later, Cold attacks Wonder Woman with most of the Society. During their confrontation, Cold calls her out for being the one who murdered his sister with Diana pointing out that he was the one who turned her to crime in the first place before defeating him. It is unknown what happened to Cold after this; however, one might assume that he turned on Grodd along with most of the others after finding out about his true goals.
In his ending, he freezes both Grood and Brainiac before they could destroy the earth, which Cold states that despite himself hating and going after the Regime, he wouldn't destroy the world. After dealing with them he visits his sister's grave, telling her that he's turning over a new leaf, making sure the regime won't happen again. He even became partners with The Flash, saying " Ironically or whatever, he's the best partner I ever had."