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.

Superman' producer Ilya Salkind reveals secrets from the set: Christopher Reeve had to gain 40 lbs. of muscle

Star Wars: Darth Vader Helped Christopher Reeve Transform Into Superman

Christopher Reeve: Remembering the 'Superman' Actor's Career

Superman: The Movie VERN'S REVIEWS on the FILMS of CINEMA

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

The Man Behind The Mask. From Strongman to Silver Screen Icon…, by Chris Frederick, Nov, 2023

Superman 1.71: The Workout

To me, he is underpaid: Superman Director Felt $3.6M Salary for 13 Days of Work Wasn't Good Enough for Marlon Brando Despite Christopher Reeve's Public Humiliation - FandomWire

David Prowse - Wikipedia

Why was Christopher Reeve's depiction of Superman so compelling? - Quora

Superman: An Irritated Christopher Reeve Once Accused Brando of “Phoning In” Film Performance – The Hollywood Reporter

A superhero legacy

How did Christopher Reeve get cast as Superman? - Quora

David Prowse, Actor Who Played Darth Vader, Dies at 85

The Silver Screen: Making Superman the Movie