Carson Beckett /

Dr. Carson Beckett is a fictional Scottish character in the Canadian-American science fiction television series Stargate Atlantis, a spin-off series of Stargate SG-1. He is portrayed by Scottish-born Canadian actor Paul McGillion, who previously played Dr. Ernest Littlefield in the first season of SG-1. Created by Robert C. Cooper and Brad Wright, the character's Scottish nationality was only decided after McGillion's audition. Dr. Beckett's character arc begins in the pilot episode "Rising". He is the discoverer and a carrier of the fictional Ancient Technology Activation gene, which allows humans to interact with specialized Ancient technology such as the Atlantis base. His medical expertise and his history with the Ancient gene earns him a spot on the Atlantis expedition, where he becomes the expedition's chief medical officer. Beckett is killed in an explosion in the third season episode "Sunday", but he returns as a clone in season four and five. The character's appearances were marked by positive reception. Despite being billed as a recurring character at first, he appeared in nearly every episode of the first season before the producers promoted him to a main character for