- He was the first actor to play Clark Kent / Superman in live-action, which he did in Superman (1948) and Atom Man vs. Superman (1950).
- After the death of George Reeves, the star of Adventures of Superman (1952), the producers considered replacing him with Alyn. The plan never materialized and the series was abruptly ended.
- At 37 years old, he was the joint oldest actor to make his live-action debut as Clark Kent / Superman. George Reeves was the same age when he made his first appearance in the role in Superman and the Mole-Men (1951).
- Had two daughters and a son with Virginia O'Brien.
- Played the title role in the 'Superman' movie serials from 1948 through 1950.
- Ex-brother-in-law of Mary O'Brien.
- He has appeared in one film that has been selected for the National Film Registry by the Library of Congress as being "culturally, historically or aesthetically" significant: Superman (1978).
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