S4, E4: Bruce Wayne puts the lives of Gotham Natural History Museum historian Niles Winthrop (guest star DAKIN MATTHEWS) and his grandson, Alex (guest-star BENJAMIN STOCKHAM), in danger in an attempt to uncover the meaning behind his prized knife from the auction. Meanwhile, Ra’s Al Ghul (new series regular ALEXANDER SIDDIG) proves he’ll take deadly measures to achieve what he wants. Also, with Sofia Falcone in town, she is on a mission to win back Gotham from Penguin.