Aboard the International Space Station in Earth's orbit, Cosmonaut Anatole Konstantinov barely avoids being struck by part of Anubis' destroyed mothership as it passes under the station � leaving a smoky trail that rises up and passes into the station unnoticed

Down on Earth, at Stargate Command, Brig. Gen. Jack O'Neill, the newly promoted chief, is drowning in paperwork when Col. Alexi Vaselov introduces himself as a new transfer. Vaselov, Russia's most highly decorated and experienced officer, has requested to be assigned to SG-1 now that there's a new opening for the fourth position, following O'Neill's promotion. But O'Neill refuses on the grounds that the colonel will have to go through Stargate Program training like any other recruit

Dr. Daniel Jackson, feeling Vaselov deserves an explanation, goes to see him. Vaselov is disturbed by O'Neill's decision and is showing signs of fatigue. Suddenly, Vaselov collapses

With Vaselov in isolation, attending physician Dr. Brightman informs O'Neill of the colonel's condition. The last thing Vaselov remembers is being in Russia. He doesn't know how he got to Stargate Command. Dr. Brightman also tells O'Neill that Vaselov has lesions covering forty percent of his body and that he might be contagious. Everyone having had contact with him must be examined. Daniel is just about to go offworld with SG-11 when the stargate shuts down. Daniel grabs a team member and holds him hostage at gunpoint, demanding that the stargate be reactivated. Teal'c fires his zat at both Daniel and his hostage, but Daniel gets up and fires wildly, wounding two Special Forces guards. O'Neill shoots him in the shoulder and Daniel falls to the floor, motionless

It's Dr. Brightman's opinion there is a contagion on base. O'Neill immediately orders all offworld teams to 'gate to the safe-haven Alpha Site and not return to Stargate Command � which is now in lockdown

Vaselov, who has had excessive exposure to the infection, is dying. Daniel was exposed for only a short time and will be fine. Soon, Vaselov begins getting flashbacks of his coming to Stargate Command, but, as he tells Teal'c, it as though he is outside his body looking in. Later, Teal'c suggests to Lt. Col. Samantha Carter and Dr. Brightman that this disease, which seems to be affecting the minds of those it infects, might not be a disease at all but an alien entity. Although tests have already ruled out the presence of a Goa'uld symbiote, Dr. Brightman's information from Russia confirms that the condition is very selective: It began with Cosmonaut Konstantinov, who'd grown ill and died within a week of returning from space. Vaselov had visited his friend and colleague Konstantinov, accounting for Vaselov's condition. But no one else who came into contact with Konstantinov was infected. It looks as though this is a new form of alien invader moving from person to person � and it could be anyone, at any time

Daniel awakens and recalls the incident in the gate room in flashbacks, as though he were looking in at his own body, just like Vaselov. Daniel eventually is able to recall who was in his body at the time: Anubis, the Goa'uld system lord who almost destroyed Earth. He is not dead, as everyone thought, but alive and on the base

According to Daniel, Anubis had surrendered his mortal form when he'd Ascended long ago, only to be cast down by the Ancients. He had since existed as a purely noncorporeal being, his physical form merely a force shield that was destroyed � releasing his essence into Earth's orbit. Now that essence has found its way to Stargate Command, where it is trying to obtain a human form so that it can 'gate back to Anubis' power base light-years away and obtain a new force shield

Daniel recalls now that Aunbis left his body to go into nurse Lt. Evans, who was caring for him earlier. When questioned, Evans has no recollection. But Airman Malcolm McCaffrey is unaccounted for. McCaffrey is heading toward the control room, taking out any guards in his way. As he commands a technician at gunpoint to activate the stargate, O'Neill zats him. Suddenly, the ethereal form of Anubis emerges from McCaffrey's body and disappears through the ceiling

Daniel proposes that the only way to deal with Anubis is to let the Ancients do it for them: If they prevent Anubis from going through the stargate and from getting into other bodies, he will have to use his powers as an Ascended being, breaking the rules of Ascension, and the Ancients will step in. O'Neill must inform the understandably concerned personnel that to prevent Anubis' escape, lockdown must continue indefinitely. There is enough food to last them a month

Carter devises an elaborate security plan, dividing Stargate Command into three secured zones. There's only one problem: Anubis is now in Carter and is headed toward Zone A, where power control to the stargate has been rerouted. The possessed Carter zats or knocks out everyone in her path, including Daniel, and she uses her security-override codes to reroute power to the control room. On her way there, she takes out one guard and tangles with another. O'Neill shows up and zats them both

Anubis has set up a sequence of automated commands to activate the stargate. With SGC security compromised, O'Neill activates the self-destruct sequence and enters the gate room, where the stargate has been activated. Anubis now inhabits O'Neill, and he's going to leave. Carter, in custody, convinces Teal'c she's not Anubis, and Teal'c allows her to stop the self-destruct. Meanwhile, the dying Col. Vaselov, who has heard the alarms, appears in the 'gate room and forces Anubis to take his body instead of O'Neill's by threatening to kill them both. Anubis does so and goes through the 'gate. But he doesn't end up where he intended: Carter was able to override the established dialing sequence and input an alternate address. Anubis, inside Vaselov's body, is now frozen solid on the icy planet KS7-535

Lockdown is over

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