Professor Zoom is the ruler of the world. The Justice League Beyond has fallen. No more heroes exist except for Wonder Woman, Lex Luthor, Jason Todd, and Terry McGinnis. Superman has died trying to fix the sun and the former Justice League Beyond members have fallen to the evil that they once sworn to fight. However, Barry Allen somehow returns and is here to defeat Professor Zoom. Barry will learn to know who Professor Zoom and that he truly is his greatest enemy.