MERLIN
Syfy, 10:00 p.m. ET
Next week is this show’s series finale, and tonight’s episode sets up the final conflict: a battle for supremacy with, on the one side, Merlin and Arthur and the knights of Camelot, and, on the other, evil sorceress Morgana. Keep an eye on her: She’s played by Katie McGrath, who, come fall, will slide into another fantasy genre series, starring as Lucy Westenra in NBC’s new Dracula.