Plot :
In Central City, rookie cop Denny Colt returns from the dead as the detective known only as the Spirit to fight crime. After he finds his nemesis, the Octopus, at the Central City mud flats, the femme fatale Sand Saref discovers two chests in a nearby pond. She tries to flee with both chests, but the Octopus shoots at her, snapping the line that connects the two chests together. After a fight with the Spirit, Octopus takes the remaining chest that Saref left behind and escapes with one of his thugs. The Octopus wants the mystical Blood of Heracles in order to become immortal and Sand Saref wants the treasure of the Argonauts, but both people end up with the wrong chest, Sand with the blood and the Octopus with the treasure of the Argonauts.