“Time Will Tell” – A grisly murder
investigation leads Castle and Beckett to a suspect (Joshua Gomez, “Chuck,” guest stars as Simon Doyle) who claims he's traveled back in time to stop terrible events from unfolding, events that
will change the course of human history. Is he simply a deluded killer, or is it possible that he's telling the truth, on "Castle," MONDAY, OCTOBER 21 (10:01-11:00 p.m., ET) on the ABC Television
Guest Cast: Joshua Gomez as Simon
Doyle, Tim Russ as Dr. Malcolm Wickfield, Vanessa Bell Calloway as Beryl Wickfield, Myko Olivier as Pi.