Anakin Skywalker Becomes Darth Vader

This scene is in Revenge of the Sith. Anakin Skywalker turns to the Dark Side of the Force and becomes Darth Vader.

Dipper Pines Becomes Dark Laser
Dipper Pines turns to the Dark Side of the Force and becomes Dark Laser

Spongebob Squarepants Becomes Kai
Spongebob Squarepants turns to the Dark Side of the Force and becomes Kai