The armies of Origin push deeper into the galaxy, conquering planets with terrifying ease. Earth's best hope for defense is the legendary weapon that Merlin developed to destroy Ascended beings, so SG-1 can't gear up fast enough when Daniel discovers a gate address to a world where the device might be hidden

Vala wants to accompany them, but Gen. Landry insists that she pass a psychiatric evaluation before joining Stargate Command as an official off-world explorer. Vala, of course, sets out to beat the tests by lying shamelessly. When her usual schemes don't work and she senses herself failing completely, however, she becomes truly discouraged. Only then does she finally consider confessing how much SG-1 and their mission truly mean to her

Mitchell, Carter, Daniel and Teal'c, meanwhile, 'gate to the planet Vagon Brei, where they stumble upon a village full of skeletal corpses. After summoning Dr. Reimer and his medical team to investigate, they continue their search for the weapon, which Daniel believes that Morgan le Fay, another Ancient, might have hidden in a nearby cave. The cave, however, is empty. Worse, one of Dr. Reimer's men, Ackerman, suddenly falls into a deep sleep � and they can't wake him up

Tests reveal that his brain is producing too much melatonin, a hormone that induces sleep. As SG-1 and the medical team begin to feel drowsy, they realize that whatever killed the villagers has infected them, too. They institute a quarantine, request that Stargate Command send them every stimulant drug and cup of coffee available, and get to work on a cure

In the last entries of the town records, Daniel finds references to a sleeping curse that Morgan cast on the villagers. With that clue, Mitchell and Teal'c explore her cave more thoroughly while Carter and Reimer discover a microscopic parasite living within the cave's soil. After Ackerman dies in his sleep, an autopsy reveals that an identical parasite, now grown large enough to cause a fatal aneurysm, has been gorging itself on the melatonin in Ackerman's brain. Morgan's curse is clearly biological � not magical � and absolutely deadly

When Reimer abruptly dies of a heart attack caused by a stimulant overdose, Carter and Daniel are left waging a losing battle to keep each other conscious. Meanwhile, at the cave, Mitchell and Teal'c discover a critical clue. But even if they muster the energy to carry it back to the village, the four can't engineer a cure without medical help

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