Turtle-Man was a Flash rogue.
Turtle-Man was one of the villains hanging out in a Central City bar. When Batman, Orion and the Flash entered the bar, he made a run for it. Turtle-Man also had his own display in the Flash Museum; it was destroyed by one of Captain Boomerang's explosive boomerangs.
In the comics, the first Turtle-Man appeared in the 1940s battling Jay Garrick, the first Flash. He was known as Turtle-Man for his slow planning. The second Turtle-Man battled the second Flash, Barry Allen, with amazing technological devices that involved slowness. Eventually the first Turtle-Man came out of retirement and teamed up with the second to try and take over Keystone city, but they were defeated.
- "Flash and Substance" (Cameo)