Disney's Forgotten (And BEST) Twist Villain

Today we're taking a look at Disney's best twist villain. Atlantis, The Lost Empire might be largely forgotten alongside it's villain Lyle Rourke, but I contend that Rourke is the best Disney twist villain to date. Together we'll take a look at some other examples of Disney Twist Villains and see why most don't work as well as examine how to make a great one.
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Sources
Clips Used
Atlantis, The Lost Empire
Big Hero 6
Zootopia
Frozen
Toy Story 3