Stargate SG-1 (1997–2007)
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The Enemy Within 

1:03 | Trailer
The team, now designated SG-1 are planning their next foray through the gate as they try to map out the variety of sites available to them and locate their missing friends. O'Neill asks ... See full summary »


Dennis Berry


Brad Wright (developed for television by), Jonathan Glassner (developed for television by) | 1 more credit »





Episode cast overview:
Richard Dean Anderson ... Colonel Jack O'Neill
Michael Shanks ... Dr. Daniel Jackson
Amanda Tapping ... Captain Samantha Carter
Christopher Judge ... Teal'c
Don S. Davis ... Major General George Hammond
Jay Acovone ... Major Charles Kawalsky
Kevin McNulty ... Dr. Warner
Gary Jones ... Sgt. Walter Harriman
Alan Rachins ... Colonel Kennedy
Warren Takeuchi ... Young Doctor


The team, now designated SG-1 are planning their next foray through the gate as they try to map out the variety of sites available to them and locate their missing friends. O'Neill asks that Teal'c be allowed to join his team but Gen. Hammond thinks that will be unlikely given that he is the host for a Goa'uld. Unknown to anyone, however, is that O'Neill's close friend, Maj. Charles Kawalsky, leader of SG-2, has been infected by a Goa'uld, an immature version that has not yet taken complete control of the host. Kawalsky is having regular blackouts during which the Goa'uld is trying to return to the gate. An MRI reveals what is wrong but it's unlikely the creature that has fused itself to Kawalsky's spine can be surgically removed. Meanwhile, Col. Kennedy arrives to question Teal'c who has pledged his loyalty to his new world. Written by garykmcd

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Parents Guide:

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USA | Canada



Release Date:

1 August 1997 (USA) See more »

Company Credits

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Technical Specs


Sound Mix:




Aspect Ratio:

16 : 9
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Did You Know?


The iris is stated to be three microns in front of the gate's event horizon. For a sense of scale an average human hair is about 40 microns in diameter, a high grade cashmere fiber is maybe 15 microns. But a single atom is only about 1/2000th of a micron. See more »


In the scenes when Teal'c is in the holding cell, the serpent symbol on his forehead is upside-down. See more »


Jack O'Neill: Permission to barge in, sir?
See more »


Featured in Stargate SG-1: Politics (1998) See more »


Main Title
Written by Joel Goldsmith and David Arnold
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User Reviews

Dark yet awesome episode.
8 May 2016 | by sam_smithreviewSee all my reviews

Great Addition to a great show:

This episode, although dealing with the formation of the "SG Teams" and looking at Teal'c's character- focuses more on how a Goa'Uld takes an unwilling Host.

I think the idea for this kind of creature came from a Robert Silverberg story called "Passengers". - where people lived in fear of "picking up a passenger", which were Entities that could take over a person, abuse that person, abuse another "passengered" person, and then leave the body. In the story, these entities would simply be seeking pleasure or mischief but they usually didn't harm their hosts, they never killed anybody, their eyes did not glow, and they were not megalomaniac power hungry dictators, but they would still cause the host body to do things it would normally not consider doing while the host consciousness had to sit there and watch it all happen.

Remember we saw a symbiont leave a dead Jaffa's pouch and jump into the non-John Deihl Kowalski (Jay Avacone- the Cop who says "What?" In Terminator 3). Since this symbiont is still in its larval stage, it cannot completely take over Kowalksi. While the symbiont is in control we see the nature of the Goa'Uld, they are not patient, they don't know how to be covert, they are demanding- basically they're all the same since they all share the same genetic memory.

And although they have a high understanding of scientific principles, they are all relatively stupid when it comes to social things like how people interact - they really don't know how to live in any kind of society where people have to live with each other, therefore they are always fighting and killing each other*. And they basically use the Jaffa to do it for them since they are too scared to risk their own lives, when they lose they escape and then they go into hibernation in a sarcophagus-resurrection box, and the nature of those things is explored later... But in the original movie that was how Ra was able to live forever (until he was blown into atom- sized pieces of space dust).

Since we never know who is really in control of Kowalski it adds a lot of suspense to this episode which was handled very cleverly, and... It shows us basically what would happen if anybody left their head in the Stargate while it was closing.

*The Goa'Uld named "Ba'Al" actually tried living with humans and other Goa'Uld in a more cooperative way, he wanted to be a "Benevolent god" - refer to the "Stargate: Continuum" movie. Basically his plan failed because he never figured on Betrayal from his Queen "Ketesh", She made him see the "two halves" of the situation, so to speak

Truly loved this episode, it didn't try and stick to a formula of everything being good and Hollywood.

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