Ichthultu

"How I've missed your people's spirit."

- Ichthultu to Hawkgirl about Thanagarians who no longer worship him. "We don't missed you. We outgrew you, thousands of years ago."

- Hawkgirl to Ichthultu about her people's millienia-old rejection of him. "Ichthultu still have faith in you."

- Last words of Ichthultu.

Ichthultu (also known as Icthultu and Great Ichthultu) was a bloodthirsty god and a powerful member of an ancient race of extradimensional monsters known as the Old Ones. He is an enemy of the Justice League and the primary antagonist of the episode "The Terror Beyond" of Justice League.

Appearance
Ichthultu's appearance is that of a giant green squid with bright yellow eyes and with seemingly-serpentine tentacles that has eyes attached to them.

History
Ichthultu and the Old Ones have been terrorizing the universe eons ago. Each planet they conquered, they convinced or forced their native inhabitants into worshipping them. Apparently once worshiped by the people of Thanagar, until their culture rejected him, as well as religion outright, having gotten tired of his constant demand for sacrifice.

Ichthultu soon changed his eyes towards Earth, starting with Atlantis. King Poseidon used all of Earth's mystical energy to forge a trident to banish the Old Ones from Earth.

Thousands of years later, Ichthultu was preparing for his return. Doctor Fate, Aquaman and Solomon Grundy began a ritual to hinder his efforts. But the Justice League's interference disrupted the ceremony, allowing Ichthultu to temporarily materialize. Fate and Hawkgirl managed to seal the rift, preventing Icthultu from entering Earth. With little choice, the Justice League went to Icthultu's dimension to stop him.

Ichthultu was apparently destroyed by the joint efforts of Hawkgirl and Solomon Grundy by destroying his brain while his fellow Old Ones forcibly retreated back to their homeworld. Even if Ichthultu survived, he was likely left powerless and brain dead for eternity. Solomon Grundy did not survive the battle but before he died, he and Hawkgirl became friends.

Trivia

 * Icthultu's name, appearance, and title as an "Old One" is based on H. P. Lovecraft's character Cthulhu.
 * Icthultu was voiced by heavy metal musician/director Rob Zombie.