New Directions continues to strategize their set list for Nationals with a little help from Jessie St. James. Meanwhile, an unexpected loss rocks the world of one of McKinley’s own.

Dave welcomes actor Martin Short, actress Melissa McCarthy from CBS's "Mike & Molly" and Tinie Tempah performs.

The lives of NCIS members are in jeopardy when they come face-to-face with the infamous Port-to-Port killer, on the eighth season finale of NCIS.

Hetty's sudden resignation prompts Callen and the NCIS team to investigate the reason why she would disappear in the hopes of tracking her down.

The players carry the weight they've lost so far during a golf-themed challenge and receive support from Season 10 champ Patrick House. Elsewhere, two finalists are named; the gang prepare turkey burgers for kids in a cooking competition; and last-chance workouts are held.

Stephen covers tax breaks for oil companies and talks to Amy Kremer dressed as an American patriot.

Despite their tense relationship, Alicia and Kalinda rush to prove their client's innocence in a murder trial. The timing may finally be right for Alicia and Will to pursue their relationship.

Guest Tonight Patton Oswalt. Betty White drops by.

Part 2 of 4. Teammates are pitted against one another when the battle round continues. Serving as advisers to the coaches: Reba McEntire, Monica, Sia Furler and Adam Blackstone.