NUMB3RS Science Guy Bill Nye guest stars as the head of the engineering department at Cal Sci in this new episode, which has echoes of Jonestown and the Branch Davidians. Don (Rob Morrow) and the team investigate a mass poisoning at a cult compound. The members refuse to get treatment for their symptoms, leading the investigators into a web of old grudges. Michael O'Keefe plays the cult leader. (N/CC/HDTV/TVPG) (1 hr.) (9 p.m. Ch. 11)