Doctor Polaris was later released from imprisonment during one of his "good" periods. He attempted to discover the source of Green Lantern's power by kidnapping his friend Thomas Kalmaku. Polaris learned Green Lantern's power battery was hidden at Ferris Aircraft and put a magnetic barrier around it which prevented Green Lantern from fully charging his ring. The hero tracked Kalmaku to Polaris' lair as his power ring ran out of energy. Polaris turned his weapon on the Green Lantern, apparently killing him. The emerald gladiator's body disappeared.