Officer stationed aboard the Prometheus. One of his posts is located in Auxiliary Control Room Two, where he used the Prometheus' Asgard sensors to detect and map the exterior of the structure of Avalon, one half mile beneath a hilltop in Glastonbury Tor, England. He was able to define a large main cavern as well as a network of smaller tunnels and caves. After Daniel Jackson and Cameron Mitchell had solved all of the puzzles Marks ringed down to the catacombs to retrieve the treasure that had become revealed. Marks was also responsible for locating the Ancient long-range communication device. Promoted to the rank of Captain, Marks was present when the Prometheus traveled to Tegalus to attack and destroy an Ori satellite weapon. Instead, Prometheus was destroyed by the device in just four shots, but Marks was among the crew who managed to evacuate. He has since been promoted to Major. PLAYED BY - Martin Christopher FIRST APPEARED - Avalon, Part 1
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