King Cobra is a legacy name used by several super-villains in the DC Universe, usually antagonists to Batman and the Batman Family. The original and most famous was a Gotham City crimeboss and leader of the Cobra Gang who wore a green snake costume. In the Prime Earth continuity, King Kobra is Jason Burr, leader of the Kobra Cult.
King Cobra was created by Bill Finger and Sheldon Moldoff, first appearing in Batman #139 (1961).
Multiverse
The New 52
Earth 6
Tales from Earth-6
Post-Crisis
Pre-Crisis
Earth-One
Shadow villain
Earth-Two
Dr. Mid-Nite villain
Earth-901
Tales from Earth 6
Other Media
See Also