- The Riddler in Batman: The Animated Series
- Lionel Luthor in Smallville
Did you know...
- Has been in four separate productions associated with DC comics. First as the Riddler in Batman: The Animated Series (1992), Dr. Jason Woodrue in Batman & Robin (1997), Lionel Luthor in Smallville (2001), then as Sivana's father in Shazam! (2019).
- His character in Gremlins 2: The New Batch (1990) was originally written as a corrupt, deeply unpleasant businessman. Glover, who was getting sick of being cast as villains, instead chose to portray him as an immensely likable and friendly, if eccentric and immature, character.
- Won Broadway's 1995 Tony Award as Best Actor (Featured Role - Play) for the dual roles of John Jeckyll and James Jeckyll in Terence McNally's Love! Valour! Compassion!, parts he recreated in the film version of the same title, Love! Valour! Compassion! (1997).