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What to Watch on Tuesday: Blurred lines on ‘S.H.I.E.L.D.’ finale

(L-R): Iain de Caestecker, Clark Gregg and Elizabeth Henstridge in the two-hour season finale of “Marvel's Agents of S.H.I.E.L.D.”
(L-R): Iain de Caestecker, Clark Gregg and Elizabeth Henstridge in the two-hour season finale of “Marvel's Agents of S.H.I.E.L.D.” ABC

Marvel’s Agents of S.H.I.E.L.D. (9 p.m., ABC) – In the two-hour finale, S.H.I.E.L.D. must survive a fight that blurs the lines between friend and enemy. Renewed.

Also on tonight . . .

NCIS (8 p.m., CBS) – After a deadly bombing overseas, the team pursues a global terrorist in the Season 12 finale. Of course this is renewed.

NCIS: New Orleans (9 p.m., CBS) – The freshman season ends with Pride having suspicions about a mole, and new intelligence indicating a breach at the ports. This will also return.

American Idol (9 p.m., Fox) – A finalist is sent home and the final two perform to win the title. The winner is revealed in tomorrow night’s finale.

Undateable (9:30 p.m., NBC) – Season 2 ends with Candace dealing with her feelings for Josh, and Shelly urging Brett to come out to his friends in London. Renewed.

Chicago Fire (10 p.m., NBC) – In the Season 3 finale, Cruz and Boden are in danger fighting an out-of-control warehouse fire. This will be back.

Frontline: The Trouble with Chicken (10 p.m., UNC-TV) – A report on the spread of pathogens in chicken and why the food safety system hasn’t stopped the threat.

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