10 Video Game Heroes Who Became Villains In The Sequel

10. Dr. Vahlen - XCOM 2

Dr. Vahlen is one of the supporting members of the XCOM team and serves as the organization's research specialist.

Unlike most of the characters from the first game, Vahlen does not make a physical appearance in the sequel, but this is because, by the events of XCOM 2, your helpful lead scientist decides to switch sides and turn into a shadowy villain with a disturbing and enigmatic motive.

In XCOM 2, your new team reveals that Dr. Vahlen mysteriously disappeared from the XCOM headquarters shortly after the aliens took over Earth, taking most of her research with her. The trail runs cold from here, but if you have the Alien Hunters DLC, you can actually find her secret lab, where Dr. Vahlen has teamed up with the occupying alien forces to experiment on the three rulers of other conquered alien civilizations to enhance them and create terrifying new breeds to unleash onto the Earth.

Her creations serve as the DLC's primary antagonists, but considering this is only one of Dr. Vahlen's many unethical experiments, maybe they should actually be called victims of a far more insidious villain.