"Marvel Studios: Assembling a Universe" 8 p.m. ABC — Behind -the-scenes look at Marvel Studios' productions.

"Glee" 8 p.m. Fox (100th episode) — Current and alumni members of New Directions reinvent favorite performances.

"NCIS" 8 p.m. CBS — A bomb explodes during the rehearsal of a military charity concert.

"NCIS: Los Angeles" 9 p.m. CBS — The NCIS team search for a mole.

"Rizzoli & Isles" 9 p.m. TNT (fourth season finale) — A senator's daughter is murdered.

"Chicago Fire" 10 p.m. NBC — Det. Lindsay narrows down suspects in Keeler's disappearance.

"Person of Interest" 10:01 p.m. CBS — The Machine tasks Root to find a janitor with a mysterious past.