04.20 Episode 86
Airdate: February 9, 2001

The MALP sent to P9C-372 is returning peculiar transmissions when suddenly a bolt of energy is sent back through the gate, shorting out the controls and the base computers. When the systems are online again, it is discovered that the unexpected energy was an alien probe which has infiltrated the computers and is accessing sensitive data. It is successfully eliminated from the mainframe, only to transfer itself to the MALP room where it begins building itself an electrical "nest" in which to expand and contain the immense amount of data it is accumulating.

O'Neill wants to destroy the nest, but Carter and Daniel believe that the probe exhibits the intelligence of a living entity, and they want to try to communicate with it. However, as Carter attempts communication, she is overcome by the probe's energy, and the entity takes over her body instead. Attempts to negotiate with the entity for the release of Carter's body fail. The entity explains that Earth's MALP had been lethal to its world, and now it has come to the SGC in order to destroy Earth in retaliation.

With the SGC and all of Earth facing annihilation, O'Neill must make the traumatic decision to kill Carter in order to stop the entity. However, as the team mourns Carter's death and prepares to eliminate the alien nest in the MALP room, an enigmatic message appears on the computer monitors: "I am here." Carter's consciousness lives on in the entity's nest, transferred there by the entity before its destruction. There is still a chance that an untried procedure will successfully return Carter to her own body.

Written by: Peter DeLuise
Directed by: Allan Lee

Guest Starring: Gary Jones as Sergeant Davis, Teryl Rothery as Dr. Fraiser, Dan Shea as Sergeant Siler

Reference: Samantha Carter, DEFCON, Entity, MALP, P9C-372, Security Lockdown, Sergeant Siler, Zat'nik'tel