 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.