For me, Mackay was Sam's Maybourne, and the two of them had a fantastic screen chemistry together, particularly in Revelations. I am slightly wary of how the character will seem without Sam. But overall, I'm thrilled that he's joined the cast of Atlantis.
DR. RODNEY MCKAY
PLAYED BY - David Hewlett
A brilliant and arrogant astrophysicist, Dr. McKay has worked with Samantha Carter (his intellectual nemesis, but also the object of his affections) on two separate occusions: once when Teal'c's pattern was trapped within the Stargate's memory ("48 Hours"), and again when an assault on the gate by Anubis caused its eventual destruction, which nearly destroyed Earth ("Redemption"). McKay is probably between 35 and 40 years old, and along with Major Carter is recognized as one of the world's leading authorities on Stargate technology and the science of gate travel.