On a seemingly abandoned planet, the team encounter a crashed alien ship called the Sebrus and the three surviving members of its crew. The crew explain that they have been stranded on the planet for some time and are being hunted down by a race of alien creatures; Carter agrees to try and fix their ship, but O'Neill becomes suspicious that all is not what it seems.
"Forsaken" provides examples of the following tropes:
- Batman Gambit: When he first begins to suspect that Reynard isn't who she claims to be, Jonas leaves her alone in his office with the coordinates for Earth on his computer, relying on her first of all to steal the address and then to convince the others that they should try to flee through the stargate rather than simply leaving in their ship
- The Charmer: Corso certainly tries to be this with his constant hitting on Carter, but she doesn't really go for it.
- Consummate Liar: Corso is a self-admitted example, claiming that it's "in his blood".
- Feminine Women Can Cook: Averted, when consummate tomboy Carter mentions that she can "make a mean soufflé". This contradicts the first-season episode "Emancipation", in which she claimed to be "a lousy cook". Unless making soufflés is a skill she's picked up since then.
- First-Name Basis: After Corso tells Carter to call him Aden, she likewise invites him to use her first name, though she revokes this privilege after finding out his true identity.
- Interspecies Romance: Warrick apparently has a human wife, as he explains that his species and the humans on his planet have fully integrated.
- Meaningful Name: Parodied:Corso: So what does it mean? "Samantha"?Carter: My father wanted a boy. What about you, does your name mean anything?Corso: Well, I was named for my Uncle Aden, who died swimming drunk across a river on a dare. And Corso, our family name, means "smells like a dead bird" in ancient Hebridean.
- Mexican Standoff: Briefly occurs between Teal'c and Warrick, before Warrick can explain that he's the real captain of the ship.
- Oh, Crap!: When Carter views the distress call from the ship's original crew and realizes that Corso and the others are escaped convicts.
- Omnidisciplinary Scientist: Carter's talents in many areas are lampshaded:Corso: So let me get this straight here, Major. You're an officer in your homeworld's military, you're a scientist, an explorer, and apparently you're a pretty fair mechanic.Carter: And I make a mean soufflé.
- Prison Ship: The true purpose of the Sebrus.
- Rubber-Forehead Aliens: Warrick and the rest of the Serrakin.
- Shout-Out: When Teal'c comments that the original Celts were formidable warriors, O'Neill tells him that he's seen Braveheart too many times.
- Space Pirate: It seems that Reynard intends to become one by escaping through the Stargate and scavenging other worlds.
- That Came Out Wrong:Carter: All we're really doing is plugging your ship into my battery.Corso: Whatever you say.Carter: ...I guess that didn't sound very good, did it?
- Violent Glaswegian: Jonas deduces that the human Hebrideans are likely transplants from Scotland's Hebrides. They speak with a General American accent, but the cultural reference is clear.
- Wrench Wench: Carter falls into this as she's fixing up the ship.