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.

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How Darth Vader Helped Christopher Reeve in his Superman Role

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

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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