04E02 - One Night in October

Olivia is summoned by Broyles that informs that The Fringe Division in the parallel universe has requested their support to hunt the serial-killer John McClennan (John Pyper-Ferguson). Olivia invites the John McClennan in our universe, who is a professor specialist in serial-killers, to go with her to the parallel universe omitting their destination. When john investigate his house in the parallel universe, he does not understand the coincidences and soon he learns that he in a parallel universe. He discloses that he might have been also a serial-killer if he had never met a woman called Marjorie, who took him from the dark side with her love. When he goes to the bathroom, he flees from the Fringe Division looking for his double to teach him love. What will happen to John McClennan?