"Merlin's Apprentice" (8 p.m., Hallmark Channel): Camelot once stood as a grand, impenetrable

"Merlin's Apprentice" (8 p.m., Hallmark Channel): Camelot once stood as a grand, impenetrable fortress -- and as the home of the Holy Grail. So when its most valuable relic vanishes, how can Camelot regain its glory? The legendary sorcerer Merlin sets off once more to save the kingdom from evil in "Merlin's Apprentice," a Hallmark Channel film. Sam Neill again stars as Merlin, who awakens after slumbering for 20 years to find the Holy Grail gone and a dark spell cast upon the land by the Lady of the Lake.