Ta-Tem was a professional thief who lived on the isle of Bokos on the planet Krypton. He conspired with a fellow criminal named Bar-Nes to purloin a glowing, yellow rock, which they believed to be a source of great power. Boarding his personal flyer, Ta-Tem traveled to the city-state of Erkol and held the Kryptonian Science Council at gunpoint, forcing them to relinquish the rock to him. However, a young boy named Val-Mer (the one who first discovered the rock), interfered and snatched the rock away before they could seize it. Presumably, Ta-Tem and Bar-Nes were arrested shortly thereafter.