Calder is a male human from the planet P3R-118 and leader of his people. He was responsible for ensuring that the workers under the city never left and continued to provide energy for the city. When Colonel Jack O'Neill criticized the treatment of the workers, he had them Memory Stamped and force to work in the power room. When he discovered that Brenna had betrayed him by trying to release SG-1, he shot her in the arm. SG-1 then took the workers to another planet and left him to fend for himself. (SG1: "Beneath the Surface")

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