A powerful sorcerer, Grelok is a recurring villain of the Grognak comic book series, being the lead antagonist in several video game adaptations of the series. In the beta version of Reign of Grelok, Grelok took over several large villages surrounding a mountain, and Grognak set out to defeat him. Grelok also had the power to rejuvenate individuals and turn them into zombies. Grelok was later defeated by Grognak, and peace was returned to the world.
- In what seems to be an alternate timeline of the Grognak series, Grognak became king of the region. Grelok was slain in this universe, as Grelok's skull and hood are seen on a King Grognak throne.
Grelok is mentioned in Fallout 3. He is also the main villain in the Fallout 4 and Fallout 76 holotape game Grognak the Barbarian and the Ruby Ruins. He also appears in Fallout 76 Atomic Shop merchandise.
- ↑ Reign of Grelok:
Horned head - When you draw your sword, Grelok lowers his great horned head and bellows laughter in your face.
Zombies - As you recover from the stench of the priestly belch, you are told that the priest has fled from his nearby chapel. When Grelok arrived on the mountain, the dead in his cemetery began to rise, and his congregation scattered.