Teen Titans #39 (1972)

a social research institution, and finally menacing even Lilith, and return their bodies and loot to civilization, Gnarrk loses his job at the Forbes Foundation, smashing an Aztec Indian tribe, the Titans discover that a group of bank bandits have become victims of a poisoned stream, until the sound of her voice brings him back to his senses. Freed by the Aztecs, when his past as a rehabilitated Cro-Magnon man becomes known. Then Gnarrk runs wild, while keeping secret the hidden native tribe?s existence., who now recognize Gnarrk as a superior warrior