Stargate Atlantis
Quarantine
S4 E13:
A nervous Dr. McKay (David Hewlett) arrives in the botany lab prepared to pop the question and finally ask Katie to marry him when an alarm sounds throughout the city. A quarantine lockdown goes into effect trapping them in the lab. McKay suspects that a highly infectious disease has triggered the city's automatic self-protection system.
Starring
Jewel Staite, David Nykl, Brenda James