“FOUR HORSEMEN.” Following the attacks on worlds throughout the U.P., the Daxamites head for Earth, driven to murderous destruction by an unstable anti-lead serum. With this, the Legion faces the most devastating battle of their first year as a team.

The Legion teams up with the Workforce to hold back four xenophobic terrorists. Under the influence of Earth's yellow sun, these Daxamite terrorists have gained Superman-like powers and have become impossible for the heroes to hold back - let alone defeat. Victory seems impossible until RJ Brande, the Legion's founder, presents his secret weapon: Jan Arrah, the last surviving transmuter from Trom.