Lieutenant assigned with the initial Atlantis expedition into the Pegasus Galaxy. When Dr. Elizabeth Weir instructed everyone to maintain a self-regulating lockdown Lt. Crown and several others remained in the mess hall during the incident.
Unfortunately, containment in the mess was breached when Dr. Peterson entered the area. Major John Sheppard and Teyla Emmagan were not far behind, assuring Crown and the others that there was no cause for concern. (Lieutenant Crown, concerned, then inquired as to why Sheppard and Teyla were in hazmat suits.)
Soon Crown and everyone else in the mess began to experience the effects of the hallucinatory virus that Peterson had transmitted to them. But Crown and the rest of the city's inhabitants were eventually healed when Major Sheppard detonated a naquadah reactor 20 miles above Atlantis.
Hot Zone - Lieutenant Crown and the other occupants of the mess are infected when Dr. Peterson breaches the containment zone.