Bueno, creo que esto lo resuelve todo. Hay algunos spoilers pero sinceramente, no destapan nada de la trama de una etapa de la serie en que todo era cada vez más absurdo:

Diana has Sean Donovan in custody and is using a mind-control drug on him. She offers him a position in the Young Guard which he accepts enthusiastically. Using him as bait, the Visitors ambush Donovan and take him into custody. He wakes from his unconsciousness to find that he lives with Julie and Sean, and it's been a year since the war ended and the Visitors left. It was Elizabeth's trip to New York that allowed the "neutron oscillator" weapon to be developed and win the war. Of course, it's all an elaborate ruse by Diana; Donovan is actually at the Visitor Embassy where holographic generators and drugs make him believe the alternate reality. In the fabricated "future," Sean plays himself while Diana wears a special amulet that makes her appear as Julie. She intends to make Donovan reveal the details of Elizabeth's rendezvous with the WLF. However, a newspaper photo of Elizabeth as a child — not as a young adult — alerts Donovan to the scam and he is able to escape.