Chronophasia.The episode begins with Æon lying on a stone slab, waking from a dream where she was screaming. We then flash back to earlier, where Æon and Trevor are making their individual ways to a Breen research base researching an ancient virus that apparently causes insanity and formed a basic part of early humanity, until they developed an immunity. Æon is cornered by the Breen soldiers near the base, but is sucked down and finds that, although the base has been there for under a month, it looks like it has been derelict for centuries. There, Æon finds a young boy who guides her through the base and eventually shows her a vial of virus, the only intact vial out of a set of five. There is also a giant fanged baby, which appears to have been the first test subject for the virus, stalking the caves. The episode revolves around Æon's continued replaying of events in different ways and eventual encounters with various fatal situations before waking on a stone slab at the center of the cave system in which the base is built. The reality of these situations is uncertain, and the boy seems to have mystic powers, isolating him from the normal flow of time. After her final waking, Æon is met by the boy, who tells her 'To you, I bequeath...my inheritance', causing her to seemingly experience the flow of time. In their final encounter, they are both encompassed by a bright light. The episode ends with a very normal scene, showing Æon in normal clothing taking the 'boy' to a baseball game.