She soon finds Max in a hidden room with a not-yet-activated device on the back of his head near the pituitary gland. She frees the boy, accidentally telling him she is an FBI agent. Believing the case completed, Olivia goes to meet with Henry, where he has gotten use of his cousin's boat. As he talks about having been trained to use it, Olivia contemplates how Wyatt knew about the chemistry to make the serum, and realizes he had a teacher as well - their true culprit, and immediately suspects Reverend Marcus. Broyles and Olivia hurry to his house to protect Christopher from Marcus; Broyles kills Marcus. Olivia accompanies Broyles and his family to the same hospital that Max is being treated. There, Max thanks Olivia personally and asks her about what the "FBI" is. Broyles, having listened to Olivia's conversation, knows that she has broken her conditioning, as the FBI had ceased to exist years earlier in the parallel universe. Because of her efforts to save Christopher, he lets her go. Olivia rejoins Henry and then leaves him to swim the rest of the way in and make her way to the isolation tank. After injecting herself with the same drugs Walternate (John Noble) had used on her, she enters the tank and soon finds herself back in her own universe. She encounters a cleaning lady, and as Olivia feels herself being dragged back to the parallel universe, she gives the cleaning lady a message to pass along to Peter (Joshua Jackson). Back in the isolation tank, Walternate has had Olivia extracted from the tank and directs his agents to lock her up and sedate her. Back in the prime universe, Peter and Fauxlivia are in bed together when Peter receives a call from the cleaning lady, who relays the message: that Olivia is trapped in the parallel universe. Peter realizes that he has been sleeping with Olivia's doppelgänger. "The Abducted" was written by co-executive producer David Wilcox and executive story editor Graham Roland, and directed by filmmaker Chuck Russell. The episode featured guest appearances by Curtis Harris, David Nykl, John Hainsworth, Karen Holness, Andre Royo, Will Rothhaar, Tristin Leffler, and Michael Strusievici. Holness and Royo had previously guest starred on "Fringe" before as the characters Diane Broyles and Henry Higgins, respectively. Alluding to the normally "no-nonsense" personality of his character Phillip Broyles, actor Lance Reddick noted that for once "you get to see [Broyles] smile and have fun.