DC Silver Age Classics Showcase 4 #[nn]

In "Mystery of the Human Thunderbolt!", Barry Allen’s life changes in an instant when a lab accident with lightning and chemicals grants him super-speed, launching him into a new identity inspired by the Flash of the 1940s. Now racing to protect Central City, he must confront the bizarre menace of the Turtle Man, a villain whose deliberate slowness makes him an unpredictable and dangerous foe.

When the criminal Mazdan is sentenced to be exiled to a distant future, a malfunction sends him hurtling back to the 20th century—where he’s quickly apprehended by the Flash. Now trapped in the past, Mazdan must face the speedster who’s determined to stop him, even as time itself begins to unravel around them.