When the passengers on a commuter train all die instantly of massive power loss, the team realizes that a time traveler is responsible... and that it may be impossible to apprehend him. Meanwhile, Walter writes a letter to Peter explaining his origins.
Quest roles:
Peter Weller, Laara Sadiq, Marie Avgeropoulos(Waitress), Jackson Berlin(ND Agent), Zoltan Buday(Worker), Robert Gauvin(Uniform Cop), Richard Harmon(Teenager), Jennifer Kitchen(Female CSI), Andrew McIlroy(Professor Lime), C. Douglas Quan(M.E. Tech), Michael Vairo(Commuter)