15 Video Game Heroes Who Became Villains 

Liu Kang – Mortal Kombat X

One of the most powerful, and longest standing warriors to survive Mortal Kombat tournament after tournament, the trained and proud defender of Earthrealm would have to see his luck run out eventually. An unfortunate split with Raiden between Mortal Kombat 9 and X saw the Bruce Lee inspired hero killed, and resurrected by Quan Chi as an undead Revenant, and slave to Netherrealm, attacking and killing those he once defended.