Fiendish Flowing Fluid Foes

Our fiendish flowing fluid foes are a couple of social miscreants who plagued the King of the Seas and the Fastest Man on Earth. The first was a mysterious malcontent named Dagon who threatened the Atlantic Ocean. The other was a greasy goon named Eel Madden always attempted to slide out of his sinister schemes in Keystone City.

Dagon developed a submersible spandex suit modeled after inhuman features that allowed its weather to survive the oceans' depths and manipulate water through hydro-kinethesis. In an untold tale, the Aquaman of Earth-One and Dagon apparently had a confrontation which culminated in Dagon's defeat and incarceration in prison, given the Sea King's words.

Rory's counterpart was Eel who developed the means to use his grease gun to cause of his opponents to slip and fall when they tried following him. Although his grease was highly flammable and should have helped him against the Earth-Two Flash, he found himself outsmarted by his fleet-footed foe. Eel then reinvented himself for his next encounter with the Fastest Man Alive.

Dagon along with four other supervillain foes of Aquaman's allies are replicated by three alien entities (Abnegazar, Rath and Ghast), and sent to attack members of the Justice League of America. These fatal five alongside Dagon were Pied Piper (foe of the Flash), the Mask (foe of Wonder Woman), Doctor Polaris (foe of Green Lantern), and Killer Moth (foe of the Batman). 

Madden changed his tactics and attempted to become a local bureaucrat of Pumpkin Center, manipulating the small township's local laws to justify his criminal acts. However, the Flash and his girlfriend Joan Williams thwarted his schemes. 

Although initially defeated by the crooked clones, the League prevails in a second confrontation with their faux-foes while also vanquishing the terrible trio behind their creation. While the Doctor Polaris clone survived and crafted a life of his own apart from the original Neal Emerson whom he was cloned from who was the original Doctor Polaris, this was no doubt due to the strong magnetic energy along with Emerson's split personality which spawned this artificial life. There is no further record of Dagon having reappeared on a later occasion.

Eel would return years later and create the city of Eelton, while maneuvering the Three Dimwits (Winky, Blinky and Noddy) into becoming the town's mayor, judge and police chief. However, Flash in his alter ego as Jay Garrick was alerted to this corrupt scheme to lure businesses to Eelton when his Garrick Research Laboratories was invited to move into its city limits, and used loopholes in the local laws to styme Madden's protection racket... causing the crook to abandon his tactics this time for good.