 Olivia and Peter first suspect Dr. Nayak 's research assistant Zach ( Jarrett Knowles ) but find him dead . Back in Boston Walter believes the chips lead to mind control and tests this on the FBI agent assigned to him while Peter and Olivia are away . However , during these tests Walter soon changes his theory ; the dreams are being stolen from their hosts to cause a " high " in Dr. Nayak , who is receiving them and has two personalities . Peter and Olivia shut down the dream equipment before Nayak kills another victim , but the doctor dies in the process . The final scene shows Peter dreaming about his childhood when Walter kidnaps him , an event Peter normally has no memory of ; Peter wakes up confused but still unaware of what his father did . 
