Darth Vader Wasn’t His Father
Originally, Darth Vader wasn’t meant to be Luke Skywalker’s father. If you rewatch the original film, you’ll notice that nothing foreshadows the fact that Darth Vader is meant to be Luke Skywalker’s father. And he wasn’t. Darth Vader was simply meant to be a crony of the emperor. He wasn’t even meant to be Anakin Skywalker at all- they were originally two separate characters. But when Empire Strikes Back was in production, George Lucas settled on the idea of making Darth Vader Luke’s father in order to add an additional layer of conflict and surprise. And it totally worked, making the revelation scene in Empire Strikes Back one of the most iconic film scenes of all time.