Episode 03 - Hide And Seek
Original air date: July 23, 2004
Dr. Rodney McKay (David Hewlett) undergoes experimental gene therapy, altering his DNA to match the Ancient genetic coding. The experiment opens up countless scientific possibilities, as well as an unexpected problem.
Meanwhile, during a game of hide and seek, one of the Athosian children inadvertently opens a containment unit that lets loose a seemingly harmless black ethereal cloud. But when Atlantis goes through a series of technical malfunctions, they realize that the shadowy creature is actually feeding off of the power supply!