The Flash #215

In "Death of an Immortal!", the Flash [Barry Allen] and Flash [Jay Garrick] are thrust into the mysterious realm of Limbo by the ancient villain Vandal Savage, who needs a powerful meteor—once the source of his near-immortality—to save his failing life. With the Guardian of the Time Stream, Tempus, watching from the edges of time, the two speedsters must survive the deadly realm and stop Savage before he reclaims the power that could end all time.

When the criminal Mazdan is sentenced to be exiled to a distant future, a malfunction sends him hurtling back to the 20th century instead—where he’s swiftly apprehended by the Flash. Now trapped in the present, Mazdan’s dangerous past and unpredictable plans threaten to unravel time itself.