Mortal Kombat: Deception
Kabal brought his new recruits to Outworld, where a siege was underway against the Dragon King. Kobra grew impatient. He wanted to join the fray. But Kabal held him back. They were not to attack until the heroes had won.
Once the Dragon King had been defeated, Kabal gave the order to strike the victors. The new Black Dragon tore through their ranks and left no survivors. Kobra came to realize that he was going to like being a Black Dragon.