NGTV Guide: Monday, May 10

Christopher “Doc Brown” Lloyd guest stars on Chuck tonight. Anybody want to take the over/under on how many Back to the Future references we’ll get? Also returning: Julia Ling as Anna Wu! Meanwhile, the Castle-Beckett-Demming triangle heats up over on ABC.

Chuck – NBC 8/7c
“Chuck vs. the Tooth” – CHUCK THE SPY NEEDS A THERAPIST – CHRISTOPHER LLOYD (“BACK TO THE FUTURE”) GUEST STARS – Chuck (Zachary Levi) struggles with disturbing dreams and now he believes his most recent dream predicts danger for a visiting head of state. General Beckman (Bonita Friedericy), however, is unconvinced and assigns Chuck to meet with a CIA psychiatrist Dr. Leo Dreyfus (guest star Christopher Lloyd). Meanwhile, Ellie (Sarah Lancaster) gets surprising news and Anna (guest star Julia Ling) returns to the Buy More to talk to Morgan (Joshua Gomez). Yvonne Strahovski, Adam Baldwin, Ryan McPartlin, Scott Krinsky and Vik Sahay also star.

Castle – ABC 10/9c
“Overkill” — A robbery-homicide prompts Beckett to invite Demming to assist on a case, giving Castle a ringside seat to their budding romance. When it becomes clear that the two men have very different ideas about how to proceed, the investigation becomes an unspoken competition for Beckett’s attention, one in which each man races to solve the case, as Beckett referees between her two admirers.