Monday's Best Bets on TV

“Heroes” (9 p.m., NBC): Can the wayward “Heroes” get its mojo back — or is it a lost cause? In tonight’s episode, Nathan learns the truth about his father, Sylar confronts Elle, and Suresh experiments with his new formula.

“Valkyrie: The Plot To Kill Hitler” (10 p.m., History): A secret plan to murder Adolf Hitler is revealed through documents and interviews.