- Although this character was originally introduced during DC's Earth-One era of publication, their existence following the events of the 1985–86 limited series Crisis on Infinite Earths remains intact. However, some elements of the character's Pre-Crisis history may have been altered or removed for Post-Crisis New Earth continuity, and should be considered apocryphal.
- 10 Appearances of Mister Esper (New Earth)
- 3 Images featuring Mister Esper (New Earth)
- Quotations by or about Mister Esper (New Earth)
- Character Gallery: Mister Esper (New Earth)
- Mister Esper/Captain Calamity article at Titanstower.com
- Mister Esper/Captain Calamity bio at the Unofficial Guide to the DC Universe
This character is or was primarily an enemy of the Teen Titans, the Titans, or any of the other various Titans incarnations. This template will categorize articles that include it into the "Titans Villains" category.