Can Olivia move between worlds? Walter confronts her with that question in this clip from Fringe. She then tries to take some pills to get rid of Peter... as a symptom.
Get a sneak peek at Fringe in this clip. It depicts Walter giving a speech, passionately explaining his beliefs in the mind and the brain. He also starts to take his pants off.
This is an early scene from the Fringe episode "The Plateau." In it, Secretary Bishop talks about the identity of Olivia and what they have to gain from this individual.
Check out this sneak peek at the Fringe season three premiere. It features Olivia in the alternate universe, repeatedly making her case and insisting: I'm not crazy.