a three-hour block of programming on Sundays when it returns in November, leading into new episodes of and reruns of fan-favorite episodes.In the season 12 premiere, titled «The Bear,» a Russian bomber goes missing while flying over U.S. soil, and Callen (Chris O'Donnell) and Sam (LL Cool J) must track it down in the desert and secure its weapons and intel before the Russians on board destroy the plane.