(All times Eastern.)

New Girl (Foxat8) Jess tries to convince everyone that she's cool with being single on Valentine's Day. Gordon Ramsay (yes, the gruff celebrity chef) guest stars.

This Is Us (NBCat9) Kevin gets unexpected support as his play opens. A flashback recalls a Valentine's Day gone awry for Jack and Rebecca.

Fresh Off the Boat (ABCat9) Jessica gets herself excluded from the local neighborhood watch group. Their loss.

NCIS: New Orleans (CBS at 10) Do you like Grammy-winning country star Maren Morris? She's performing in this episode, which is part of a crossover with "NCIS."

Taboo (FX at 10) The East India Company declares war on James.

Premiere

Secrets of the Underground (Science Channel at 10) Scientist and tech enthusiast Rob Nelson investigates subterranean mysteries and legends. The premiere focuses on the secret underground escape route rumored to have helped gangster Al Capone elude authorities.

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Documentaries

American Experience: Ruby Ridge (WETAat9) This one-hour documentary recalls the deadly 1992 standoff at Ruby Ridge in Idaho.

Independent Lens: Tower (WETAat10) Director Keith Maitland uses animation to reconstruct events from the 1966 sniper attack at the University of Texas. The 90-minute documentary also includes archival footage and interviews with survivors.

‘Tower’ a well-crafted documentary that deliberately leaves out major detail

Special

Katherine Ryan: In Trouble (Netflix streaming) The Britain-based comedian riffs on dating, white privilege and Taylor Swift in this stand-up special, filmed at London's Apollo Theatre.

Late Night

Conan (TBS at 11) Nick Kroll, John Mulaney, Jake Tapper, Middle Kids.

Daily Show (Comedy Central at 11) Laverne Cox.

Fallon (NBC at 11:34) Charlie Day, Kendall Jenner, NxWorries.

Colbert (CBS at 11:35) Christine Baranski, Hans Zimmer.

Kimmel (ABC at 11:35) Denzel Washington, Lukas Graham, plus the 2017 Sports Illustrated Swimsuit Issue cover model.

Corden (CBS at 12:37) Katherine Heigl, Andrew Rannells, Lisa Hannigan.

Meyers (NBC at 12:37) Shailene Woodley, Annaleigh Ashford, Evan McMullin.

— Bethonie Butler

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