Darth Vader Played a Crucial Role in Helping Christopher Reeve Become Superman – The Hollywood Reporter

Calling the actor a "skinny little kid" when they met for his audition, Richard Donner made Reeve promise he would be able to bulk up for the role.

Christopher Reeve's Superman is back, and still relevant after 45 years - Daily Planet

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Bizarre Facts Most People Don't Know About Christopher Reeve's Superman Movies

David Pruss, the actor who embodied Darth Vader, the villain of Star Wars - Free Press

David Prowse Dead: 'Star Wars' Man Behind the Darth Vader Mask Was 85 – The Hollywood Reporter

Superman II (1980) - News - IMDb

10 Things You Didn't Know About the Superman Movies

The Dude Who Played Darth Vader Helped Christopher Reeve Bulk Up For Superman

Superman ii hi-res stock photography and images - Alamy

The Silver Screen: Making Superman the Movie