Tessek was a Quarren male from the water planet of Mon Calamari. He once had ties with Republic politics, but when the Galactic Empire invaded his home planet, he fled and became a member of Jabba Desilijic Tiure's court. While serving as the Hutt's accountant, Tessek planned to kill his master by planting a bomb on his sail barge. Tessek managed to survive the Battle of the Great Pit of Carkoon after escaping on a speeder bike—however, when he returned to Jabba's Palace, his brain was forcibly removed from his body by the B'omarr Monks.