Dan is not alone in his tendency to time-travel. His ex-fiancée Livia, thought to have been killed in a plane crash, actually traveled back to her "home time", 1948, from where she jumps "forward" in time. Dan meets Livia on his jumps into the past, as she jumps into her future to offer her experience and assistance with Dan's missions. As revealed in the episode "Perfidia", there was at least one other person who also jumps through time, named Evan. However, the death of that individual occurs shortly before Dan experiences his first jump in the first episode, bringing the whole series full circle, making Dan believe that the loss of Evan as a time traveler created a void which Dan filled. Livia and Dan also sensed that Livia's purpose in accompanying him came to an end at that point, and that they would not see much of each other after that mission.