He figured that the only way to take out Flash was to take him out cold...like, with absolute zero.
Thus, began the career of one of the oldest of the Flash's villains, Captain Cold.
Here's a look back at his earliest appearances.
Coldest Man On Earth
This story had Captain Cold first using his cold gun (a weapon he roughly designed but after using a cyclotron to irradiate the gun, found it able to shoot ice blasts instead) on the banks of Central City, which brought him into conflict with the Flash.
After a few experiments, Captain Cold found he could also create illusions with the gun, when adding liquid helium. Facing Flash on a nearby lake, Captain Cold attempted to use this new cold gun ability on the Flash, but Barry Allen proved too fast for him!
The Big Freeze
So, Captain Cold escapes using a small freeze unit to allow him to break out of his cell.
Once out, he goes after Iris West, but not to harm her, but to try to convince her to marry him. Iris, already Barry's fiancee, says no, but Captain Cold then threatens to freeze the entire city. Flash, adventuring outside the city, breaks the cold barrier, eventually capturing Captain Cold and restoring the frozen Central City to normal.
When Gravity Went WildClock King) in Justice League of America #5 (June-July, 1961) by Gardner Fox, Mike Sekowsky and Bernard Sachs in the first major villain team up of Earth-1.
While the villains do keep the heroes busy for a while, they are defeated by the heroes, who then have to deal with Dr. Destiny.
This tale was reprinted in the first Justice League of America Archive and Omnibus, as well as in Justice League of America #39 (November, 1965).
Double Danger On Earth
Jay Garrick, the Flash of Earth-2, comes to Earth-1 looking for an Arizona meteorite that was absorbing a deadly radiation killing his Earth, and goes to look for Barry Allen (Flash), who is attending a charity party that is a target for both Captain Cold and the Trickster, who, start at odds, but then decide to team-up to take off with the money.
The two Flashes go to find the meteorite, then, work together to stop the two villains before Jay goes back to his own world with the meteorite cure.
The Man Who Mastered Absolute ZeroElongated Man.
Flash and Elongated Man were helping Dr. Hutson with a problem with his computer, but couldn't find any problems. Captain Cold broke out of jail, and Flash and Elongated Man go to capture him, but Ralph Dibny stretches out to stop Flash, allowing Snart to escape. Captain Cold tries again, with Flash and Elongated Man there to stop him, or at least Flash was. Elongated Man again tries to help the captain, but Flash stops both Ralph and Snart. Elongated Man is beside himself with guilt, but Barry figures out that the computer was generating a radiation that was preventing it from functioning, and that radiation had infected Ralph, so, ridding them both of it fixed the problem.
If you don't mind black and white tales, it was also done colorlessly in both Showcase Presents the Elongated Man and Showcase Presents the Flash.
The Heat Is On For Captain Cold
Flash is searching for a missing girl for Henry Willens, an attorney who represented her father, who passed recently, so she can receive her inheritance. Captain Cold has recently escaped again, so Flash quickly catches up to him, but so does a new player, Heat Wave. The two villains team-up to escape the Flash, but quickly go to war while chasing a "Dream Girl", a TV model, still stopping when Flash shows up...and stops both of them. Flash then meets this "Dream Girl", who is Priscilla Varner, who happens to be the missing girl.
Captain Cold's Polar Perils
Police scientist Barry Allen is called into service to escort Ayesha, the Maharanee of Jodapur, during her stay in Central City. While picking up her jewels, Captain Cold appears to attempt to steal from the jeweler. Barry secretly changes to the Flash, but is unable to stop Captain Cold. But, Snart had become infatuated with Ayesha, so he returns her jewels, then escorts her away from a party, where Flash tracks him down, capturing him, then returning the lady to her party.