"You must help... you."
— Harlan
The team discovers that their robot doubles have secretly been going on missions through the Stargate. The robots have now been captured by Cronus, and Hammond authorizes the "real" team to undertake a rescue mission.
"Double Jeopardy" provides examples of the following tropes:
- Back for the Dead: The robot duplicates, not seen since Season 1.
- Big Damn Heroes: Teal'c shows up just in time to save his robot double from getting killed by Cronus. And then robot Teal'c returns the favor moments later, by finishing Cronus off as he's killing the original Teal'c.
- Bulletproof Human Shield: Teal'c takes one of Cronus' Jaffa guards as a shield to protect himself from Cronus. However, Cronus just shoots his guard because it would be harder for Teal'c to hold up a dead guy, and anyway, he has many other guards.
- Continuity Nod: Cronus points out that he warned the team they would be severely punished if they strayed into his territories.
- Dressing as the Enemy: Robot O'Neill disguises himself as one of the enemy soldiers to sneak into the temple where Cronus is holding the rest of his team, not that it does them any good.
- Easily Forgiven: Robot O'Neill seems to forgive Darien fairly quickly for being the one to carry out the execution of robot Daniel.
- Face Death with Dignity: Robot Daniel seems fairly accepting of his fate, signalling to O'Neill not to intervene before closing his eyes and waiting for the blast.
- Fearful Symmetry: Downplayed; O'Neill and his robot double's Snark-to-Snark Combat turns into a scuffle before Carter breaks it up.Carter: Uh, sirs, as much as I'd like to see how this plays out, don't we have something more important to do?
- Foreshadowing: Quite a bit in regards to first team being the robot duplicates, most of it pretty subtle.
- Daniel and Carter have the hair styles they have in Season 1.
- O'Neill's hair is brown instead of grey, as it was in Season 1.
- The entire team is using MP5s instead of P90s which they recently switched to. The fact that Teal'c is using a human weapon instead of a staff weapon is also unusual. Presumably, the robot version doesn't have a staff weapon.
- The team is visibly confused by Cronus' I Warned You. They also seem to have no memory of being on this planet before and Carter is baffled at being addressed as "Major."
- Grievous Harm with a Body: Robot Carter rigs the power unit in robot Daniel's decapitated body to self-destruct when Cronus's minions start tampering with it.
- Heel–Face Turn: Darien pulls one when Cronus's shocked reaction on finding out the team are robot doubles is enough to convince him Cronus is not a god.
- Heroic Sacrifice: Robot Carter sticks her hand into a forcefield that delivers painful — and ultimately fatal — electric shocks, in order to disable the doors on Cronus's ship and allow the original team to escape.
- I Lied: Robot O'Neill's answer when O'Neill reminds him that he was supposed to bury the Stargate on Harlan's planet.
- I Warned You: See Continuity Nod above.
- Identical Twin ID Tag: The robot duplicates of Carter and Daniel both have noticeably longer hair than their human counterparts, similar to the styles they wore in the first season, and Robot Jack's hair is not grey, also like Season 1, which acts as an early indicator that this may not be the "real" SG-1 before The Reveal.
- If You're So Evil, Eat This Kitten!: Cronus orders Darien to kill robot Daniel — whom he still believes to be the real thing — in order to prove his loyalty. He does.
- Killed Off for Real: Cronus, as well as the robot team.
- Not So Omniscient After All: Cronus is as shocked as anybody to find out that the team are actually robots, which really undermines his whole "god" thing.
- Off with His Head!: Darien shoots robot Daniel in the face with a staff weapon, knocking his head clean off his body. This tips off the spectators to the fact that he's not quite human, seeing as how the stump is filled with exposed wiring rather than the blood and gore that one might expect.
- Other Me Annoys Me: O'Neill does not think much of his robot clone, and the feeling is definitely mutual.
- Sequel Episode: To both "Tin Man" and "Fair Game".
- Snark-to-Snark Combat: O'Neill gets into this with himself, again.
- Spoiler Opening: Averted. There is no "Previously On..." referencing "Tin Man" to clue viewers in.
- Stealth Insult: When Hammond finds out that the robot team have not exactly kept to their word and have been going through the Stargate on missions, he has this to say to O'Neill:Hammond: It would seem your robot counterpart is equally as good at following orders as you.
- They Killed Kenny Again: All of the robots die, but Daniel is the first to go and his death comes before it's officially revealed to the audience that this is not "our" team.
- Tomato Surprise: The audience is led to believe that it is the normal version of SG-1 that arrives on Juna...until Darien kills Daniel with a staff weapon and his head comes off, revealing that he is a robot. In the next scene, Harlan contacts the SGC, confirming that they are the robot duplicates from "Tin Man".
- Torture Technician: Ja'din, the female Goa'uld working under Cronus, ostensibly seems to be some kind of scientist tasked with figuring out how the robots operate, but she takes great pleasure in torturing robot Carter and robot Teal'c.
- Trojan Prisoner: Darien smuggles robot O'Neill into the temple by pretending that he's a prisoner, so that the human team can follow him in and take care of the guards while they're distracted.
- What Measure Is a Non-Human?: Robot O'Neill calls his human counterpart out on his dismissive attitudes towards the robotic versions as he's dying. The concern the robotic versions have shown each other, plus their willingness to give their lives for this planet and their human counterparts is apparently enough to change O'Neill's mind.Robot O'Neill: Are we still so far from real to you?O'Neill: No, I guess not.
- You Killed My Father: Robot Teal'c manages to get an audience with Cronus in order to exact his revenge for the murder of his (well, the original Teal'c's) father. He is mortally wounded in the fight, but eventually gets his wish, killing Cronus with his last breath in order to save his Jaffa counterpart.Robot Teal'c: For our father.
