In this two-part series finale, Morgana prepares for war with Mordred. As a great horde gathers, Merlin feels the pressure and the ancient prophecies begin to play out. A battle rages on the plain as Merlin finally faces his destiny. Space, 7 p.m.
The French ski resort of Tignes hosts some extreme winter sports action as more than 150 athletes compete. This European edition features separate men's and women's events in superpipe and slopestyle skiing, as well as snowboarding. ABC, 1 p.m.
Relive the excitement as the teams strive to complete a full dinner service in sync with three runway shows during a special fashion night. But first, the cheftestants are challenged to impress Ramsay with an appetizer and entrees. Fox, 10 p.m.
American Ninja Warrior
Matt Iseman hosts this special edition, which includes footage and compilations of last season's breathtaking Las Vegas finals round. The competitors face a four-stage obstacle course modelled after Japan's Mount Midoriyama. NBC, 7 p.m.