"Entity" is the twentieth episode of the fourth season of Stargate SG-1.


An "entity" from P9C-372 invades the computer at Stargate Command through the MALP transmission. It starts controlling cameras and learning. When Major Samantha Carter starts communicating with it, it invades her and takes control of her.


When Stargate Command dials P9C-372 and send a MALP, they discover highly advanced life. Suddenly the MALP seems to start flying, and before the connection is lost, the computers overload. Colonel Jack O'Neill cuts power to the gate manually, but computers are behaving as if controlled by an intelligence. Soon SG-1 realizes an alien life force has taken over the base's computer system. It uses cameras to follow their actions and shuts down the computers if necessary. When Major Samantha Carter wants to reboot the SGC's network, formatting drives and rebooting from the unnetworked backups from the day before, everything seems to be normal again. Only a minute later, a section is detected infested by the program/being, which had stored itself on the drive of a MALP. When SG-1 break their way into the MALP-room, the entity has used the MALP, then other machines and all computers in the room to build a supercomputer. It runs on the battery powering the emergency lights in the room.

Dr. Daniel Jackson argues instead of destroying the machine as O'Neill suggests, they should use the interface it provided (a keyboard and monitor). Carter asks the entity what it wants, and after a reply from the machine, an electric current runs from the keyboard to her fingers. She faints and is brought to the infirmary. Finally, through Carter, the entity is able to communicate its intentions: to destroy the threat Earth poses to its homeworld. SG-1 finds out that when the SGC had sent a MALP to the world, the Earth radio equipment needed to control their robot interfered with the aliens on the world, destroying many of them. Interpreting the action as an attack, the alien entity was sent to infiltrate the SGC's computer system and destroy the facility. While matter can only travel the way a gate was dialed, the entity, like radio waves, could use the radio carrier wave to get into the computer (though when the gate was shut down, it had not had time to complete the total destruction it intended).

Angered with the fact that it uses Carter as host, O'Neill tells the alien that if it stays in Carter's body, the SGC would send wave after wave of MALPs to his planet unless it gave Carter back. In agony, Carter's body breaks free from the restraints it was put in, is trapped in the hall and (picture) emits an energy beam to the mainframe (via the lights and power outlets in the hall). O'Neill zat's Carter's body once but it does nothing. O'Neill is forced to zat her again (which should kill her). Carter falls to the floor. In the medical room Carter is on life support with O'Neill sitting watching over her. Dr. Janet Fraiser comes in and asks if Sam ever told him about her living will (that she doesn't want any extraordinary means) to which he replies, "Yeah, she told me." Dr. Frasier tells O'Neill there is no brain activity of any kind and that "I think it's time to let her go." O'Neill quietly asks Dr. Frasier to "wait a minute, huh?" Back in the MALP room, SG-1 sees "I AM HERE" written again and again on the screen. They realize it might be Carter, and Dr. Fraiser connects Carter's body to the supercomputer. Immediately a power surge enters the body, and the supercomputer shuts down. Carter's consciousness, restrained while the entity was in her body, is now returned to her body, and she is soon conscious again. Hammond orders the planet locked out of the dialing computer.


Appearances for Entity





Sentient Species



Notable quotes[]

(Immediately after sending the MALP through the gate)
O'Neill: (to Teal'c) You look tense.
Jackson: No, I'd say anxious.
Teal'c: I am neither tense, nor anxious, perhaps concerned.
Jackson: Why?
Teal'c: The address of this planet was procured from the repository of the Ancients.

Hammond: What's it doing?
Carter: Flying, Sir.
O'Neill: MALPs can't fly.
Jackson: Apparently that can.
O'Neill: Shouldn't there be a memo on this stuff?

Carter: Sir, very high frequency oscillations are being transmitted on a feedback loop.
Jackson: They may be trying to communicate.
O'Neill: They?
Jackson: Well, whoever...they are.
O'Neill: Exactly.
Jackson: What?

Frasier: Some form of energy came through the Stargate. Its only prudent to make sure there's no physiological effects to those exposed. ASAP.
O'Neill: Who put her in charge?
Hammond: The US Air Force.
Teal'c: In medical matters, Doctor Frasier may overrule those of any rank.
O'Neill: (To Daniel) I'm not getting all my memos!

(O'Neill is dancing back and forth in front of a security camera being controlled by the alien Entity in the computer system)
O'Neill: I think it likes me!

(SG-1 sees the mainframe the entity built in the MALP room)
O'Neill: General, we're gonna need some claymores down here.
Hammond: I'm on my way.
Jackson: You wanna blow it up?
O'Neill: Yes.
Jackson: Why?
O'Neill: "Why!?"
Carter: Sir, we've completely isolated this area of the base, there's no chance of reinfection of our computer.
Jackson: It's obviously fighting to survive.
O'Neill: So do bacteria.
(the screen brings up Carter's file)
Carter: It's trying to communicate.
O'Neill: So do bac...

Jackson: In a way you succeeded. We won't go back there. You can repair the damage we did and we won't send any more probes through.
O'Neill: Yes we will.
Jackson: Jack?
O'Neill: We'll send dozens of them. One after another. I don't care what it does.
Carter: No.
O'Neill: Leave her. Now.
Carter: You won't.
O'Neill: You've read my file. Think again.


Main Characters

Guest Stars


  • The actions of Carter's mind while in the MALP Storage Room computer are very similar to the actions of the Alien "Entity" known as Jerry in Michael Crichton's Sphere. In Sphere, the hostile Alien refers to himself as an "Entity," possibly responsible for the title of the episode. The Alien speaks to the team through the computer systems, at one point posting the message "I AM HERE." on the computers. This is, of course, identical to the message posted by Carter. This is one of many Stargate SG-1 episodes bearing an extreme likeness to novels written by Michael Crichton. Other episodes have resembled Prey, The Andromeda Strain, and Timeline very closely.
  • When the Entity looks up O'Neill's personnel file, the display reads "John O'Neill." Traditionally,"Jack" and "John" are hypocorisms of Jonathan. One of the files it skips by reads "Lee Van Cleef".
  • This episode is the only one to be shot completely in HD until the Season 8 premiere episode, "New Order, Part 1". Starting with "Nemesis" all episodes were shot completely in 35 mm. Previous episodes were all filmed in 16 mm (except the effect shots).


  • In the briefing room when the Entity is reading Jackson's file, at the bottom of the screen, it shows his birthday as being April 1, however in the season 3 episode, "Forever in a Day," he himself establishes that his birthday is July 8.
  • The Entity transferred Carter's mind to its mainframe yet there was nothing to power it to keep her alive as O'Neill had destroyed the power supply.
  • Colonel Jack O'Neill verbally interrupts the entity while it is using the voice emulator which should not be possible. The entity first types out what it wants to say before the emulator starts speaking making it impossible to be 'cut off' in mid sentence.

Other languages[]

  • French: Entité (Entity)
  • Italian: Entità (Entity)
  • Spanish: El Ente (The Entity)
  • Czech: Entita (Entity)
  • German: Die falsche Wahl (The Wrong Choice)
  • Hungarian: Személyiség (Personality)

Links and navigation[]

Smallwikipedialogo This page uses content from Wikipedia. The original article was at Entity (Stargate SG-1). The list of authors can be seen in the page history. As with SGCommand, the text of Wikipedia is available under the GNU Free Documentation License.
v  e
Episodes and Seasons
Season 1 12345678910111213141516171819202122
Season 2 12345678910111213141516171819202122
Season 3 12345678910111213141516171819202122
Season 4 12345678910111213141516171819202122
Season 5 12345678910111213141516171819202122
Season 6 12345678910111213141516171819202122
Season 7 12345678910111213141516171819202122
Season 8 1234567891011121314151617181920
Season 9 1234567891011121314151617181920
Season 10 1234567891011121314151617181920
Season 1 1234567891011121314151617181920
Season 2 1234567891011121314151617181920
Season 3 1234567891011121314151617181920
Season 4 1234567891011121314151617181920
Season 5 1234567891011121314151617181920
Season 1 1234567891011121314151617181920
Season 2 1234567891011121314151617181920
Season 1 12345678910