Military officer stationed alongside John Sheppard's team, instructed to monitor a colony of Wraith recently converted into humans with Dr. Carson Beckett's iratus bug retrovirus. Morrison was sent to search for Lathan, one of the test subjects, but was not able to locate him.
It was later that he and Beckett found Lathan's corpse, realizing that it was placed to appear as if Lathan had died accidentally. Morrison himself was killed by Michael and other Wraith who had begun to revert back to their true selves.
Misbegotten - Morrison remains behind with Beckett to supervise the Wraith colony, but is killed while Sheppard's team is gone.