Appearing in the Green Lantern: The Animated Series episode "Heir Apparent," Dulok was a Green Lantern from the planet of Betrassus. Dulok had planned to join a band of Green Lanterns tasked with fighting off the Red Lantern Corps, but was murdered by Ragnar, the planet's crown prince. After Dulok's death, his ring passed to Iolande, the young queen of Betrassus.