- John Glover portrayed Mr. Sivana in Shazam!. This makes him one of the few actors to date to have appeared in both the Marvel Cinematic Universe and the DC Extended Universe.
- John Glover is one of the actors to portray characters for both Marvel Television and DC Entertainment. He portrayed Jason Woodrue in Batman & Robin, Lionel Luthor, Clark Kent, Jor-El and Darkseid (while possessing Lionel's body) in Smallville and voiced Riddler in Batman: The Animated Series.
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