|Played By:||Laurie Murdoch|
Caulder is the administrator of the inhabitants of P3R-118. Caulder used his authority and position to live a life of luxury along with those which lived in the dome city above ground, whilst those below believing to be working for their survival, work in the power generating facilities below.
Knowing full well of the situation, Caulder maintained that what was happening was the best for the planet, and when Jack O'Neill and SG1 found out about the truth, and threatened to expose him, he had their memories changed, and forced to work below in the power generating facilities. However, SG1 slowly regained their memories, and managed to overthrow Caulder and showed those who lived below what has happening above ground.