Christopher Lloyd is an actor who joins the show in season 3.
He has previous experience with time travel as Dr. Brown in Back to the Future.
He has previous experience as a a villain as Hacker in Cyberchase.
He is first seen at the end of episode 5 Causality in an uncredited moment where he is adjacent to a didaster.
In the following episode, the heroes believe he may be the "Salesman" they had come to find, with Cole dubbing him the "Reaper".