Kalmec commands the Olmec army as King Menator's primary enforcer. He strategically organizes the defense of the Olmec stronghold, the Mountain of the Burning Shield. His loyalty to Menator is absolute, addressing him solely as "Master" and fully supporting the king's extreme goal of revitalizing the Olmec race. Kalmec actively pursues the Olmecs' genocidal ambitions, rejecting all truces or alliances with other civilizations. His methods and ideology are crueler than Menator's, showing a willingness to eliminate any obstacle to Olmec dominance, including a commitment to worldwide genocide for Olmec prosperity.

He leads Olmec forces directly in the conflict over the Cities of Gold, attacking the protagonists and groups like the Mayas during the race to secure the golden city's secrets. His actions intensify during the pursuit of the powerful Great Legacy artifact, believed essential for Olmec survival. Kalmec successfully steals this artifact and transports it back to the Mountain of the Burning Shield.

Activating the Great Legacy, later revealed as a fusion reactor, triggers a catastrophic meltdown causing widespread earthquakes and volcanic activity that threatens global destruction. Kalmec's theft directly causes this crisis. Ultimately, during the ensuing chaos, he is overtaken and defeated by the advanced technology of the Mu Empire.