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.

15 Things Man Of Steel Did Better Than Superman: The Movie

APPRECIATION: R.I.P. to David Prowse. The Original Body Actor for Darth Vader and the Man who Trained Christopher Reeve to Gain Muscle Weight to Play Superman. : r/DC_Cinematic

Movie Forum: Star Wars into Darth-ness

Remembering Richard Donner, Superman's real-life best friend

A superhero legacy

Star Wars actor David Prowse passes away aged 85 - Courageous Nerd

James Earl Jones: Most Up-to-Date Encyclopedia, News & Reviews

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

Original Darth Vader actor David Prowse dies at 85.

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