Tezumak was a South American monk from a pre-Aztec, Mesoamerican civilization based in ancient Mexico. He took the name Tezumak and joined a group of ancient warrior led by Gamemnae. He wears large bronze armor, which honors the ancient gods who first brought science to his people.

Working with the League of Ancients, they battled the JLA, who had been lured back in time to search for the missing Aquaman. Tezumak later learned Gamemnae's plan, which involved exterminating the JLA; he revolted, ultimately sacrificing his life to help bring about her defeat.