According to Mark Hamill, until the screening of The Empire strikes Back, Harrison Ford had no idea that Darth Vader was in fact Luke's father due to a Non-Disclosure Agreement .
- I didn't tell Harrison, or my wife because it would be terrible if she said something to a fan and it got out.
- When we saw the first screening Harrison turned to me and said "You never told me that."
That is pretty crazy to know just how secretive Lucasfilm was with perhaps the biggest plot twist EVER! It was definitely a lot easier to keep a secret in the 70's. In today's world, it seems as if every plot twist is spoiled one way or another online, unless you are Star Wars of course.Brandonbaker01 (talk) 16:52, December 13, 2015 (UTC)