10 Video Game Villains Who Switched Sides (To Fight Something Worse)
2. GLaDOS Is A Lot Nicer As A Potato - Portal 2
GLaDOS from the Portal series is one of the most iconic villains in the history of video games. Everything from her cold but ruthless insults to her menacing design screams evil, and yet in Portal 2 she ends up helping Chell.
And it's all thanks to one quick makeover into a potato.
The main, if not the only reason, why GLaDOS switches sides in the sequel is because she is replaced as Aperture Science's overseer.
After you and your new dumb but lovable companion Wheatley defeat her, the core takes her position to let you escape but is then quickly corrupted by his new power and decides to betray you while also turning GLaDOS into a potato battery.
From then on, the two of you are cast into the deepest parts of the labs and have to work together to find a way out. However, survival is not the only reason why GLaDOS helps you, as she is also deeply concerned about Wheatley's stupidity destroying the laboratory that she's devoted her whole existence to.
In fact, after you save the facility from Wheatley, she's so glad to have regained her little kingdom, she decides to let you out alive, forgetting all of your past grievances.