The Turtle is a DC Comics villain and an enemy of the Flash.
Little has been revealed about the Turtle’s origins. The Turtle made his first appearance in the 1940’s as a villain who used tricks of slowness in battle with the Flash, but whose main weapon was slow, deliberate planning.
Justice League Unlimited
In the episode "Flash and Substance", Turtle is seen at a bar with a bunch of other Flash villains. A wax statue of him later appears in the Flash museum but it is destroyed much to Flash's dismay.