Blue Devil (DC Comics)

Blue Devil (Daniel Patrick Cassidy) is a superhero appearing in American comic books published by DC Comics. He first appeared in a preview insert published in Fury of Firestorm #24 (June 1984), followed by Blue Devil #1, also cover dated June 1984. He was created by Dan Mishkin, Gary Cohn, and Paris Cullins. The Blue Devil comic book ran for 31 issues and one annual. Blue Devil later appeared as a regular character in Shadowpact, which ran for 25 issues.

Dan Cassidy was working as a stuntman and special effects specialist in Hollywood when he became permanently bonded to an exoskeleton suit created for a film. This unnatural fusion of magic and technology caused him to experience unusual events and draw the attention of otherworldly beings. Horrified at the prospect of being stuck in the suit, Cassidy sought ways to separate himself from it, becoming a reluctant superhero along the way. Cassidy was eventually transformed into an actual demon after making a deal with the demon Neron. Regretting the deal, Blue Devil decided to fight occult evil, often alongside the other members of Shadowpact.

Cassidy's original trident was a mechanical device that he designed himself, but, after being turned into an actual demon, he acquired the magical "Trident of Lucifer" to help combat demons.

Blue Devil has appeared in the animated series Justice League Unlimited and Young Justice as well as the live-action DC Universe series Swamp Thing, in which he was portrayed by Ian Ziering.