[3] Dan Cassidy was working as a stuntman and special effects specialist in Hollywood who became permanently bonded to an exoskeleton suit created for a film.

Gary Cohn recounted how he and writing partner Dan Mishkin created Blue Devil: Our editor for a number of things we were doing was a guy named Dave Manak.

[citation needed] Daniel Patrick Cassidy is a special effects wizard and stuntman hired to create and play the title character in the movie Blue Devil.

After failing to find a way to remove his costume, Cassidy starts to enjoy his new lifestyle, and becomes more and more comfortable as a superhero, even accepting a place in the Justice League of America.

[8] He gains a sidekick when Eddie Bloomberg, his former gofer and devoted fan, designs a suit similar to his own to adventure as Kid Devil.

[9] During the Underworld Unleashed event, Blue Devil is approached by the demon Neron, who is known for offering Faustian bargains to heroes and villains alike.

Believing it to be a relatively harmless act, having checked that nobody was working that night and a relay station would kick in to carry the load, Blue Devil complies and inadvertently causes the death of Marla Bloom, the aunt of Cassidy's best friend Eddie, as the resulting power outage in other electrical towers causes a crash that kills Marla.

[11] Blue Devil is resurrected again by Sebastian Faust, who hopes to gain his assistance restarting the fires of Hell during the Day of Judgment storyline.

Blue Devil stalls Nebiros, stripping him of his trident and allowing Firestorm to deal the killing blow; back on Earth, the other heroes of the Sentinels of Magic save the world.

One Year Later Blue Devil is employed as a bouncer at the Oblivion Bar, an interdimensional place for magical beings, and there he is recruited by Ragman, Enchantress, and Detective Chimp to battle the Spectre in Day of Vengeance.

With his enhanced demonic strength, he is the heavy hitter of the Shadowpact, the assemblage of magical heroes devoted to fight for every "lost cause".

He further explains that the very same moment the demonic Neron granted fame and powers to Cassidy as Blue Devil, the dead parents and siblings of Patrick were dragged from Heaven to Hell.

Zauriel, on behalf of his good faith, takes Blue Devil's place in the Shadowpact, giving him enough time to get out of his infernal deal.

Blue Devil puts his case in the hands of an eager lawyer, more than happy to be able to confront Hell itself in a hall of justice.

Returning to Hell for the final hearing, he discovers that Jack of Fire was the one selling his sibling's soul first, with Blue Devil merely following unwillingly.

[13] Jack of Fire is now allied with a seemingly all-powerful Sun God, but plots to betray him in retaliation for his harsh treatment and to lead an army of demons on Earth.

Instead, after a brief confrontation, acknowledging that the Sun God will eventually kill him for his betrayal, he commits suicide in front of Cassidy, naming him inheritor of all his powers and demonic status - but without forfeiting his soul.

He is later traumatized by Sargon's sacrifice to let almost all heroes intervening in the War of Hell escape to Nanda Parbat and is later the only one convinced of reuniting the Shadowpact by Detective Chimp.

[14] While Zatanna is sent to gather the Justice League, Blue Devil and the Stranger attempt to stop the Black Lantern Spectre, failing miserably.

A fight ensues, but Blue Devil quickly gets the better of Black Lightning and tries to make him listen, when he is interrupted by the LAPD, who are ready to open fire.

[16] During the Forever Evil storyline, Blue Devil is among the magic users who were captured by Felix Faust and Nick Necro to use them as part of a weapon that would defeat the creature that destroyed the Crime Syndicate's Earth.

His costume included kevlar body armor, visual and auditory amplifiers, radio gear, mini-gills allowing underwater breathing, and servo-motors which increased his strength at least twentyfold.

In his current incarnation, Blue Devil still possesses some degree of superhuman strength, capable of going toe-to-toe with beings like Eclipso, and knocking out a power-drunk Enchantress in one punch.

He is also remarkably resistant to physical damage, evidenced when Eclipso threw him a distance of approximately 500 feet upwards, he did not even require time to recover before getting up and heading back into the fight.

Originally, Blue Devil wielded a trident of his own design which included, among other things, rocket engines capable of carrying two people at high speeds.

During a battle with Eclipso and the Spectre the trident was thrown into the ocean; it was recovered shortly after by Aquaman who returned it to Cassidy, and much later given to Jack of Fire.