Stargate SG-1/Singularity

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Season 1, Episode 15
Airdate October 31, 1997
Production Number 114
Written by Robert C. Cooper
Directed by Mario Azzopardi
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Stargate SG-1Season One
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Singularity is the fifteenth episode of the first season of Stargate SG-1, and the fifteenth episode overall.

Guest Stars: Gary Jones (Technician/Sergeant Walter Davis), Teryl Rothery (Dr. Janet Fraiser), Katie Stuart (Cassandra), Kevin McNulty (Dr. Warner)


Plot Overview

The SG-1 team travels through the stargate to planet PX3-987, where another SG team has been making preparations to observe a black hole. But, when they get there, they discover that a strange disease has wiped out everyone on the planet. Everyone that is, except a little girl named Cassandra. As O'Neill and Teal'c remain on the planet to observe the black hole, Carter and Daniel return to Earth with the girl. Carter grows especially close to Cassandra and is shocked when she discovers that the chest pains Cassandra is experiencing are caused by a metallic device growing around the child's heart. Daniel and Carter are certain that the Goa'uld planted the device as part of a scheme to destroy the Earth's stargate. As the time bomb ticks down, Carter is torn between her love for the little girl and her knowledge that the child is being used as a Trojan horse by the Gou'ald.


  • Syndication airdate: February 1, 1999.

Arc Advancement


  • This episode marks the first appearance of the System Lord Nurrti.


  • Daniel's allergies are mentioned again in this episode when Daniel sneezes after decontamination, Jack asks if it's his allergies. After this episode they are only mentioned sporadically, in The Gamekeeper and One False Step.
  • Teryl Rothery and Katie Stuart previously appeared in the film "Masterminds" together.



The Show

Behind the Scenes

Allusions and References

Cassandra was the most beautiful of the daughters of Priam and Hecuba, the king and queen of Troy. She was given the gift of prophecy by Apollo, who wished to seduce her; when she accepted his gift but refused his sexual advances, he deprived her prophecies of the power to persuade. At the end of the Trojan War, Cassandra foresaw the danger posed by the Trojan horse; the people of Troy ignored her warnings and the Greek soldiers hiding inside the horse were able to capture the city. During the sack of Troy, Cassandra was raped by the Locrian (or "lesser") Ajax, and was then given as a war prize to Agamemnon. She returned to Greece with Agamemnon, and tried to warn him of the danger which awaited him there; once again her prophecy was ignored, and both she and Agamemnon were murdered by Clytemnestra and Aegisthus.

Memorable Moments


  • Hanka was called PX8-987 on the sign, but in other episodes, it's called P8X-987.


Teal'c: I still do not understand this black hole.
Jack: Well a black hole is... is really... a big thing ... it's a ... well basically it's a ... massive... hole... OK?
Teal'c: .......I see...
Jack: ...What happens is: everything gets sucked in to it. Even light. That's why we can't see it. ... just... gets...... sucked in...
Teal'c: Thank you...
Jack: Sure...


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