Torri Higginson

When Ducky determines that one of his research cadavers was the victim of murder, the NCIS team uncovers a web of criminal intrigue.

After Ducky is stabbed at a crime scene, the team uncovers disturbing secrets from the good doctor's past.

When Rodney McKay (David Hewlett) realizes Atlantis has started shutting down artificial gravity and collapsing protective shields to compensate for a damaged power system he turns off all non-essential systems. But when the problem persists McKay is forced to collapse the shield to the point where it is only protecting Atlantis' main tower leaving the rest of the city exposed to space.With the protective shields down and an asteroid belt fast approaching Lt. Col. Sheppard (Joe Flanigan) leads a group of Atlantis personnel on a desperate jumper mission to clear a path for the city. Meanwhile Dr. Keller's (Jewel Staite) attempts to resuscitate a comatose Elizabeth Weir (Torri Higginson) reveal that her patient has severe brain swelling and will require radical surgery. McKay runs the calculations and realizes there's an even bigger problem: in just 28 hours the city's shields will fail completely and all of Atlantis' inhabitants will succumb the vacuum of space.

Lt. Col. Sheppard (Joe Flanigan) leads his team on a daring raid on the Replicator home world in a bid to secure a ZPM that will save Atlantis. The key to their operation is none other than Dr. Elizabeth Weir (Torri Higginson). Directed by Weir and McKay (David Hewlett) from the jumper Sheppard and Ronon (Jason Momoa) head deep into the Replicator city to acquire the sought after prize. But a surprising revelation concerning a long-dormant Replicator sub-routine changes the plan forcing Sheppard and company to forego their quick escape. When the Replicators become aware of the incursion Sheppard's team must keep them at bay or else abandon the mission and their hope of saving Atlantis. Meanwhile Colonel Carter (Amanda Tapping) aboard the Apollo searches in vain for the missing city.

As Dr. Rodney McKay (David Hewlett) struggles to figure out why the stargate has been inoperable for over a week a mysterious probe plunges into the city. A subsequent decryption sweep of the probe offers McKay a shocking glimpse of nanite code before his diagnostic program crashes and all the data is lost. Meanwhile Lt. Col. Sheppard (Joe Flanigan) Teyla (Rachel Luttrell) and Ronan (Jason Momoa) have noticed that the some of the crew are behaving oddly. The mystery deepens still further when a former member of the expedition is discovered lying unconscious in a hidden room. Convinced that the replicators have finally found their location the team grapples with these implications unaware that their problems may very well be insurmountable.