Dan Cassidy was a special effects wizard and stuntman whose credits had included The Battle of the Las Vegas Showgirls and Space Ninja when he was hired by his friend, film director Marla Bloom, to create and play the title character in the Verner Bros. monster movie Blue Devil. Cassidy's specialty was somewhat unusual - rather than create optical effects that would later be applied in post-production, Cassidy specialized in "in camera" mechanical and cybernetic effects. To that end, Cassidy created a full-body costume for Blue Devil, complete with a powered exoskeleton and built-in pyrotechnic devices. Cassidy also created a rocket-powered prop trident which was, among other things, capable of flying.