Mortal Kombat X Storyline (Mortal Kombat Series)

Mortal Kombat X
"Millions of years ago, Shinnok, one of the Elder Gods turned on his fellow deities and invaded the Earthrealm. Raiden and the Elder Gods stopped Shinnok, and locked him up in the Netherrealm. Others followed in Shinnok's footsteps, like Outworld's Emperor Shao Kahn who was obsessed with conquering Earthrealm. So Raiden convinced the Elder Gods to enact the Mortal Kombat tournament as a way to even the odds, give Earthrealm to chance. For generations Shao Kahn followed the Elder Gods rules. The war moved to the arena where he sent his toughest fighters to challenge Raiden's greatest defenders in mortal kombat. Two years ago we beat him, but Shao Kahn wasn't ready to lose. He violated the rules of Mortal Kombat and invaded Earthrealm. Most of Earth's defenders, our friends, were killed turned into evil undead warriors. Despite the odds, we stopped Shao Kahn's invasion. As punishment, the elder gods destroyed him. We thought the long nightmare was over. But it turns out that Shinnok had been manipulating events. Shao Kahn's invasion, his death, all part of Shinnok's plan to escape the Netherrealm and resume his war on the Elder Gods." -Johnny Cage
Erron Black killed Kobra
Before fighting Kano, Erron mentions killing another Black Dragon named Kobra.

Johnny Cage is Cassie Cage's father

Sonya Blade is Cassie Cage's mother