O'Neill, Carter, Daniel, Jacob and Martouf are still being held prisoner on Netu, where Apophis is now planning to overthrow Sokar and tortures them for information one by one. Meanwhile, Teal'c makes contact with the Tok'ra homeworld in the hopes of orchestrating a rescue.
"The Devil You Know" provides examples of the following tropes:
- Ace Pilot: Teal'c gets to show off his skills once again in executing a particularly difficult maneuver at the episode's climax. Specifically, he has to bring the cargo ship to a complete stop in exactly the right place underneath Sokar's mothership to intercept the matter stream of the others being beamed up. If he's even slightly off, he could miss part of the stream and end up bringing somebody aboard with missing limbs, or worse. Needless to say, he pulls it off.
- Big Damn Heroes: Teal'c punches out Aldwin and locks him in the ship's hold in order to embark on the above-detailed rescue of the others minutes before the moon explodes.
- Big "NO!": Sokar gets one after Apophis escapes, just before Netu blows up.
- Break the Haughty: Subverted and lampshaded by O'Neill, when it becomes clear that months of unimaginable torture have done nothing to put a dent in Apophis's ego as he delivers a typically melodramatic speech to the other denizens of Netu.O'Neill: Well, this experience doesn't seem to have humbled him much.
- Bring Him to Me: Carter, O'Neill, Martouf and Daniel are dragged from their cell one-by-one to face Apophis's "interrogation".
- Crocodile Tears: Martouf of all people pulls this in order to make the false information he gives Apophis convincing.
- Did You Just Flip Off Cthulhu?: The first thing Daniel does when faced with Apophis is taunt him about his mate Amaunet's recent death. The incredulous looks that O'Neill and Carter give him say it all.
- Disc-One Final Boss: After being built up as a potential new Big Bad for the season, Sokar is killed off in fairly anticlimactic fashion thirteen episodes in, allowing Apophis to once again take the reins as the show's primary antagonist.
- Earth-Shattering Kaboom: Aldwin fires a nuke into Netu's core, triggering a chain reaction that results in the entire moon blowing up.
- Evil Versus Evil: Apophis vs. Sokar. Apophis wins.
- Explosions in Space: When Netu blows up, complete with Planar Shockwave.
- Fantastic Drug: The Blood of Sokar, which causes extremely realistic hallucinations for whoever drinks it. Apophis combines it with the Tok'ra memory device when torturing his victims, just for extra Mind Screw.
- Force Feeding: Carter and O'Neill are both shown having the Blood of Sokar poured directly down their throats when they refuse to cooperate.
- A Glitch in the Matrix: There's something just slightly off about each of the memories experienced by Carter, O'Neill and Daniel in turn that enable them to resist the Blood of Sokar's effects by realizing it isn't real.
- Godzilla Threshold: The Tok'ra see Sokar as such a threat that they're willing to blow up a moon for a shot at killing him. All the prisoners there, including their own friends and allies, are an unfortunate but acceptable sacrifice.
- Hyperspeed Escape: Happens off-screen, but Teal'c mentions that he pulled one in order to escape the death gliders that made his position during the last episode.
- I Will Punish Your Friend for Your Failure: Apophis does this twice. First of all, he threatens to kill Jacob if Carter doesn't tell him what he wants to know. Later, he brings Carter in as he's torturing Martouf, getting one of his Jaffa to aim a staff at her head and threatening to fire unless Martouf reveals the location of the Tok'ra homeworld.
- Mind Rape: Apophis uses the Blood of Sokar in conjunction with the memory device on each of his victims, forcing them to relive painful memories involving someone they love/trust that have been twisted slightly in the hopes of tricking them into telling him what he wants to know. In order:
- Carter relives a conversation she had with her father shortly after her mother's death, where she was able to forgive him for his part in it. "Jacob" tells her that he's dying and asks for the code to open the iris on Earth's stargate.
- O'Neill sees his son, who offers to play a game of catch with him in exchange for information on the location of the Asgard and the Ancient repository device.
- Daniel relives a conversation with O'Neill in the wake of Sha're's death, where O'Neill states that he believes in him and asks for the name of the planet where Amaunet hid the Harcesis child.
- Missing Mom: It's revealed that Carter's mother died in a car accident when she was a teenager. Both she and her brother are stated to have blamed Jacob for a while, though Carter says that she forgave him a long time ago.
- No Endor Holocaust: In an example strikingly similar to the trope namer, the planet Delmak is apparently unharmed after its moon explodes.
- No One Gets Left Behind: Teal'c refuses to even consider leaving his teammates on Netu, despite Aldwin dropping a bomb on it.
- Nuke 'em: Aldwin has orders to nuke Netu in order to take out Sokar before he can challenge the system lords. The Tok'ra council are willing to accept SG-1 and their own operatives as collateral damage; Teal'c isn't.
- Only a Flesh Wound: Averted when O'Neill gets shot in the leg with a staff weapon at the start of the episode. He's shown to be in great pain, spends most of the time when he's not being tortured sitting in a corner of the cell, actually passes out from the pain at one point, and has to be practically dragged to the ring transporter by Daniel when they make their escape.
- Punch! Punch! Punch! Uh Oh...: Daniel invokes this deliberately when he spots the communications device on the other side of the room where Apophis has been torturing him. He punches one of the Jaffa knowing that it won't have any effect except piss the guy off enough to punch him across the room, allowing him to surreptitiously grab the device while no one is watching.
- Retractable Weapon: Apophis has a retractable blade in the sleeve of his armor that he uses to kill Sokar's mooks while they're distracted by the moon starting to blow up around them.
- Ship Tease: Carter and Martouf again. Notably, he admits that he knew it was Carter and not Jolinar being threatened by Apophis while he was under the influence of the drug, but he still couldn't bear to watch her die.
- The Starscream: Apophis pledges his allegiance to Sokar for the sole purpose of getting close enough to kill him and take control of his fleet. Which he pretty much does, except for the fact that he doesn't get to kill Sokar personally.
- Throat Light: When Sokar tortures Apophis with the Goa'uld cattle prod.
- Torture Always Works: Averted; none of the heroes give up any useful information under duress, much to Apophis's annoyance.
- Torture Chamber Episode: Most of the episode revolves around the team either being tortured or sitting around in a cell waiting to be tortured.
- Torture for Fun and Information: Apophis does want information from the team, but given the whole "arch-nemesis" thing it's fair to say that he's also enjoying it immensely.Apophis: (to O'Neill) You're not here to provide information. You are here for my amusement.
- Waking Non Sequitur: O'Neill mumbles that he "doesn't want to go to school" in response to Daniel shaking him awake when he's dragged back to the cell unconscious.
