Tuesday’s TV highlights

SERIES

NCIS: In the conclusion of the two-part season finale, Gibbs (Mark Harmon) goes to Mexico to confront a drug cartel. Michael Weatherly and Pauley Perrette also star (8 p.m. CBS).

The Biggest Loser: All of this season’s contestants reunite before the season’s winner is announced (8 p.m. NBC).

American Idol: Crystal Bowersox and Lee DeWyze each sing three songs in the Season 9 finals (8 p.m. Fox).

NCIS: Los Angeles: Callen (Chris O’Donnell) tries to find a woman with information about his past. LL Cool J and Linda Hunt also star in the first season finale (9 p.m. CBS).

Dancing With the Stars: The winner is revealed in the season finale (9 p.m. ABC).

Glee: In this new episode, Will (Matthew Morrison) wants his charges to use the music of Lady Gaga as their springboard for self-expression. Lea Michele, Jenna Ushkowitz star, with guest stars Idina Menzel and Jonathan Groff (9 p.m. Fox).

The Good Wife: In a powerful season finale that addresses the show’s core issue, Alicia (Julianna Margulies) is being urged by Eli (Alan Cumming) to decide whether she will stand by Peter (Chris Noth) during his new political campaign or pursue a relationship with Will (Josh Charles) (10 p.m. CBS).

MOVIES

Burning Ice: Scientists, writers, artists and others journey to the Arctic Circle to witness firsthand the effects of global warming in this new documentary (8:30 p.m. Sundance).

SPORTS

Tennis: French Open (9 a.m. ESPN2).

WNBA Basketball: The Phoenix Mercury visit the Tulsa Shock (4 p.m. ESPN2).

Soccer: United States vs. Czech Republic, from Hartford, Conn. (4:30 p.m. ESPN).

Baseball: The Dodgers visit the Chicago Cubs (5 p.m. KCAL); the Toronto Blue Jays visit the Angels (7 p.m. FSN).

Basketball: NBA playoffs: The Lakers visit the Phoenix Suns (6 p.m. TNT).