Rodney McKay

Meredith Rodney McKay, Ph.D, is a fictional character in the 2004 Canadian-American Sci-Fi Channel television series ''Stargate SG-1'' and ''Stargate Atlantis'', two military science fiction television shows about military teams exploring two galaxies (Milky Way and Pegasus) via a network of alien transportation devices.

Played by British-born Canadian actor David Hewlett, McKay was a main character in all five seasons of ''Stargate Atlantis'' (2004–2009). Earlier he held a recurring role in ''Stargate SG-1'' for four seasons (2002, 2004, 2006, 2007). In 2011, McKay was featured in an episode of ''Stargate Universe''.

Doctor Rodney McKay is a contractor for the United States Air Force and makes his first appearance in the ''Stargate SG-1'' episode "48 Hours", the fourteenth episode of ''Stargate SG-1'' Season 5, as a scientist who joins the fictional Stargate Program. McKay was seen in two more episodes of ''Stargate SG-1'' before becoming a main character in ''Stargate Atlantis'' which was set in the Pegasus Galaxy. His next appearances in ''Stargate SG-1'' were in Alternate timeline and different realities until the crossover episode "The Pegasus Project" in season ten. Overall, McKay and Joe Flanigan's character John Sheppard are the only two characters who appeared in every episode of ''Stargate Atlantis'', with McKay being the character with the most screentime. Provided by Wikipedia