Teal'c is running through Apophis' palace on Chulak, holding a staff weapon. He looks terrified, and frequently turns and fires his weapon down the hallway, presumably at following enemies. He hits his radio and shouts for Jackson, then Carter, then Mitchell and Vala, but recieves no response regardless of who he asks for.
As he turns a corner, he finds a flurry of staff blasts coming at him, and he dives behind a stone outcropping (although no enemies can be seen; the blasts appear to be coming from nowhere). He fires off a counterattack, then leans back against the wall, breathing hard.
Knowing he needs to get going again, Teal'c stands and hurls his staff forward. The staff slams into the wall at the far end of the corridor, sticking in a good foot, and a few of the incoming energy blasts drop off, as if an adversary had been taken out. Teal'c quickly pulls his zat off his belt and fires it towards the wall several times, continuing until the blasts finally cease. Still breathing hard, the Jaffa warrior turns, glad that this is over.
But when he turns, he freezes, his eyes widening; Apophis is standing before him, his hand device raised. The Goa'uld smiles grimly, and sickly tells Teal'c "Hello there, Shol'va" before everything flashes white. Teal'c screams and shoots out of his bed, grabbing the staff weapon lying nearby. He is on Chulak (the city can be seen out the window), not Earth, and has clearly been having a nightmare. After a moment, a Jaffa soldier comes in, sking if he's okay, to which Teal'c replies, breathlessly, "No..."
The next day, Teal'c waits at the stargate on Chulak (a settlement has sprang up around the gate, stretching all the way back to the original city in the hillside). The portal actives and the rest of SG-1 walks through, asking their friend how his time passing legislation over the last few days went. He smiles and replies that much was accomplished, but it's clear he's very tired. Carter asks what's wrong, but he says that they cannot discuss it here, and invites them back to his lodgings.
As the five of them make their way through the settlement back to the city. Teal'c becomes more and more distracted, his voice often trailing off (although it is gleaned that Chulak; currently has a population "half that of Earth's", is still the official capital of the Jaffa Nation despite the completion of Dakara's reconstruction over the last month, and has its Capitol building in the palace that formerly was the home of Apophis). Finally, Daniel grabs him by the shoulder and tells him to explain what's going on.
Teal'c, though, doesn't seem to hear him. When the Jaffa turns, he sees Apophis grabbing him, not Jackson. In a rage, he pulls out his zat and stuns Daniel, but the "Apophis" vanishes in a flash of light, re-appearing over Vala. Teal'c goes to stun her, too, but Mitchell quickly pulls out his own zat and shoots Teal'c, knocking him unconscious. Surprised and confused, the still-standing members of SG-1 radio for aide.
A few hours later, Teal'c comes to inside the Palace. To his surprise, a duo of Jaffa guards are standing nearby, their staff weapons pointed at him. He demands to know what is going on and struggles at his bonds (he has been tied to a bed), but no one answers until the door opens and SG-1 and Bra'tac enter. Carter explains that he was detained after attacking Daniel, fearing that he had been brainwashed (as many Jaffa were by Ba'al in "Stronghold"), and this is for the safety of all those on the planet.
But the Jaffa warrior insists he did no such thing; the only person he raised his weapon against was Apophis. This, of course, elicits some confusion from the others, who know that Apophis was killed almost seven years before over Netu ("Enemies"). When pressed on the subject, Teal'c merely repeats his claim, saying that his former "God" has been appearing to him of late. Somewhat startled that he'd harm his own friend, he admits that something must be wrong.
Bra'tac suggests a scout ship be sent to the ruins of Netu to confirm that Apophis' ha'tak met its fate there. Although it is extremely unlikely he escaped, nothing can really be ruled out when it comes to the Serpent God, and SG-1 agrees. Carter and Vala join a small group of Jaffa and they depart for the planet's spaceport for transport. In the meantime, Mitchell and Daniel begin poking around the city for clues as to why Teal'c is suddenly seeing a Goa'uld so many years after his death.
While they're exploring the area, Mitchell spots a group of Jaffa children sparring with wooden staff weapons (much like the ones seen in "Alleigence") and asks to join. Remembering his training from the Sodan, he easily disarms an adolescent Jaffa male, but the boy seems insulted that a human could defeat him. He spits in Mitchell's face and stomps away, shouting a phrase in Goa'uld that Jackson translates as "A stain on purity". Curious, Mitchell decides to investigate while Daniel continues on for clues to Teal'c's visions.
After some time of searching, Daniel stumbles upon a run-down building on the edge of a forest. He surmises that it once served as a symbiote holding center in the days of the System Lords, and approaches with caution. He pushes the old, creaking door open and steps inside, seeing nothing but cobwebs and shattered glass.
Almost at once, though, he hears a staff weapon open behind him, and dives to the floor as a burst of plasma flashes by overhead. Turning onto his back, Jackson is shocked to find Apophis standing there, preparing to fire again. But before he can, Daniel raises his P-90 and fires a round off, causing the illusion of Apophis to vanish in a flash of light. Confused, the SG-1 member gets up and radios Mitchell to tell him what's happened, but his teammate tells him that he's busy following the Jaffa teenager from earlier.
On the other side of the settlement, Mitchell seems to have found something, too. A large group of adolescent Jaffa (a vast majority of which are male) have gathered in a makeshift camp hidden behind a cliff-face. They all wear decorated golden armbands on their forearms, which Mitchell likens to young gang members on Earth wearing colored bandanas. After a few minutes of eavesdropping, he gets the picture; this is a group of Jaffa youth who believe that humans are a stain upon the galaxy, taking the rightful glory of the Jaffa away from them. They see their brother race (particularly the Tau'ri) as a bad influence that must be silenced, and are amassing a great deal of support on a number of worlds.
This, of course, is bad. If the future leaders of the Jaffa Nation are slowly being turned against Earth and other human worlds, things bode ill in the continuing struggle against anarchists like Garrin. Mitchell goes to radio Jackson to alert Earth, but pauses when a group of the Jaffa youth appear a few feet away, armed with staff weapons and demanding he come with them. Not having a choice, he does.
Meanwhile, Daniel has brought a group of Jaffa scientists (and Bra'tac) to the old building he had his vision in. Using scanning devices similar to those found on Earth (no doubt the Jaffa were helped in their develpment by the Tau'ri), they begin searching for energy readings. After a moment, they find one, a big one. And after blasting through a wall at the far end of the building, they get a shock; a secret chamber built into the mountainside.
While they explore this new chamber, Bra'tac notices a very-obviously Goa'uld device glowing in one corner. When he approaches, though, he suddenly freezes, muttering that he sees Apophis standing nearby, threatening to kill them all. Thankfully, though, Daniel convinces him it's not real, but some of the Jaffa scientists do not believe him. They attempt to shoot "Apophis", hitting each other in the process. Jackson and Bra'tac take cover, unable to do anything, and wait until it's over. They make their way over the bodies to the device, which they decide to take back to Earth for study.
Teal'c, meanwhile, has finally been released from protective custody, and is taking a stroll through the woods outside the city. Suddenly, he hears shouting, and pulls out his zat, going to investigate. He happens upon the meeting of the Jaffa "gang" and sees a bound Colonel Mitchell being beat by the teenagers with wooden staffs. Teal'c quickly rushes in, zatting boys left and right as he does, finally coming gun-to-gun with the oldest of the group, their leader. The young adult is shocked that Teal'c has not seen the evils of the Tau'ri yet, how they seek to destroy the power of the Jaffa. But the aging warrior reminds the child that he did not have to live through a hundred years of Goa'uld oppression, and that all that is thanks to Earth. Were it not for the humans, they would still be slaves (the debate continues for a few minutes, but that is the basic idea).
Finally, the boy lowers his weapon, and agrees to at least try talking out his anger with human representatives before resorting to violence, but he warns Teal'c that there are far more radical sects out there that will not see it this way.
Later, on Earth, Dr. Lee has managed to figure out the origin of the Goa'uld device; it was created by Apophis' elite scientists shortly before his death to instill fear in enemy populations. It sends out a signal in a short radius that causes shifts in brainwave patters, causing hallucinations of him. Teal'c must have passed by the building of late and been affected without realizing it. The device has probably been on for years, and no one knew. But now he's reversed it's effects and stored it away, so it can no longer do any harm.
After the meeting is over, Teal'c, Daniel, and Mitchell meet with Carter and Vala to swap what they learned; Apophis' ha'tak is scattered around Netu, they need not worry about seeing him again. But Mitchell and Jackson are both worried about this anti-human movement they saw, and wonder if one day soon they'll be meeting Jaffa on the battlefield again...