greys-anatomy-300-episode-meredith-grey-seattle-alex-karev-4Somehow “Grey’s Anatomy” (ABC, 8 p.m.) has reached its 300th episode, bypassing “Murder, She Wrote,” “Fraiser,” “Perry Mason” and “Cheers” in longevity. Started in 2005, it spends tonight’s show dealing with with a possible metaphor, a roller coaster accident, and remembers some of the original cast members, long since gone.

Sam goes on a trip with her daughters on “Better Things” (FX, 10 p.m.).

The Penguin seeks revenge on “Gotham” (Fox, 8 p.m.).

Slide returns on “Arrow” (The CW, 9 p.m.).

Thursday Night Football has Seattle at Arizona (NBC, 8:20 p.m.).

Gretchen Carlson, Anita Hill and Sen. Kirsten Gillibrand are guests on a town hall discussion hosted by Alisyn Camerota, “Tipping Point: Sexual Harassment in America” (CNN, 9 p.m.).

The bad news is that it’s already the season finale for “Nathan for You” (Comedy Central, 9 p.m.). The good news is that the episode, about helping a Bill Gates impersonator, is two hours long.

Annie Potts joins the cast of “Young Sheldon” (CBS, 8:30 p.m.).

“The Cromarties” (USA, 10 p.m.) is a new series about NFL player Antonio Cromartie and his growing family.

It’s already time to get ready for Fashion Week on “Project Runway” (Lifetime, 9 p.m.).

Sigourney Weaver pops up on the eighth season finale of “Doc Martin” (Acorn TV, streaming).

Sam and Dean investigate a case involving a ghost on “Supernatural” (The CW, 8 p.m.).

Jen invites her boss over on “Life in Pieces” (CBS, 9:30 p.m.).

“S.W.A.T.” (CBS, 10 p.m.) goes after four escaped convicts.

Val’s twin daughter goes missing on “Ghost Wars” (Syfy, 10 p.m.). Not to be confused with “Real Estate Wars” (Bravo, 10 p.m.).

On “How to Get Away with Murder” (ABC, 10 p.m.), Annalise works on her class action lawsuit.

They’re making pies on “Chopped” (Food, 9 p.m.).

On “Scandal” (ABC, 9 p.m.), a new crisis emerges in the Middle East.

Vanessa’s past returns on “Van Helsing” (Syfy, 9 p.m.).

Ray returns from rehab on “Mom” (CBS, 9 p.m.).

The investigators on “The Eleven” (A&E, 10 p.m.) head to Panama City.

The Braxton spinoff “Tamar & Vince” (WeTV, 9 p.m.) returns for a fifth season, though it may be the last; she filed for divorce recently.

“The Orville” (Fox, 9 p.m.), somehow renewed for a second season, mediates a peace treaty.

Turner Classic Movies plays the original non-musical versions of popular titles: “Anna and the King of Siam” (8 p.m.), “Kismet” (10:30 p.m.), “Little Ship of Horrors” (12:30 a.m.), “Auntie Mame” (2 a.m.) and “Gigi” (4:45 a.m.).

NBA action includes Cleveland at Houston (TNT, 8 p.m.) and Oklahoma City at Denver (TNT, 10:30 p.m.).

College football has Ball State at Northern Illinois (CBS Sports, 7 p.m.), North Carolina at Pittsburgh (ESPN, 7:30 p.m.) and Georgia Southern at Appalachian State (ESPNU, 7:30 p.m.).

In soccer there’s Northern Ireland vs. Switzerland (ESPN2, 2:30 p.m.) in a FIFA 2018 World Cup qualifier. And it’s U.S. vs. Canada (ESPN2, 10 p.m.) in a women’s international friendly.

Daytime Talk

Kelly Ripa and Ryan Seacrest: Kenneth Branagh, Ellen Pompeo, Daveed Diggs. The View: Martha Raddatz, Ellen Pompeo. The Talk: Mark Wahlberg, Paula Abdul. Harry Connick: Kate Bosworth, Gladys Knight. Steve Harvey: JB Smoove. Ellen DeGeneres: Wanda Sykes, Halsey. Wendy Williams: Van Jones.

Late Talk

Stephen Colbert: William H. Macy, Jay Pharaoh, Rationale. Jimmy Kimmel: Josh Hutchinson, Dale Earnhardt Jr. , Dan Auerbach. Jimmy Fallon: Gal Gadot, Desus & Mero, Miley Cyrus, Billy Ray Cyrus (rerun). Seth Meyers: Mark Wahlberg, Martin McDonagh, Nathan Davilmar. James Corden: Gael Garcia Bernal, Jason Momoa, Sam Smith. Carson Daly: Sarah Wayne Callies, Andrew McMahon, Ross Lynch. Trevor Noah: Van Jones. Jordan Klepper: Jen Esaki. Conan O’Brien: Will Ferrell, Mark Wahlberg, Mel Gibson, John Lithgow, Linda Cardellini, Rachel Feinstein, Jon Dore.