“Grey's Anatomy” (ABC at 8) In the long-running drama’s 300th episode, a roller coaster accident leaves Meredith (Ellen Pompeo) and her colleagues tending to patients who remind them of people from their past. (Derek Johnson/ABC)

(All times Eastern)

Gotham (Fox at 8) Penguin seeks revenge against Nygma after hearing about his antics at Cherry’s.

Young Sheldon (CBS at 8:30) Annie Potts joins the cast as Sheldon’s beloved Meemaw.

Arrow (CW at 9) Slade returns and enlists Oliver in his quest to find his son.

Better Things (FX at 10) Sam and her daughters go on a trip.

Premiere

The Cromarties (USA at 10:30) This reality series follows former NFL all-pro Antonio Cromartie and his wife, Terricka, as their blended family prepares to welcome a sixth child.

Returning

Tamar & Vince (We TV at 9) Season 5.

Finales

Doc Martin (Acorn TV streaming) Sigourney Weaver returns in the Season 8 finale.

Nathan For You (Comedy Central at 9) In Season 4’s two-hour finale, Nathan attempts to help a Bill Gates impersonator reunite with a long-lost love.

Project Runway (Lifetime at 9) The designers vie for limited Fashion Week spots in the first half of the season finale, which concludes next week.

Late Night

Conan (TBS at 11) Will Ferrell, Mark Wahlberg, Mel Gibson, John Lithgow.

Daily Show (Comedy Central at 11) Van Jones.

Colbert (CBS at 11:35) Louis C.K., Jay Pharoah, Rationale.

Kimmel (ABC at 11:35) Josh Hutcherson, Dale Earnhardt Jr. Musical guest Dan Auerbach

Corden (CBS at 12:37) Gael Garcia Bernal, Jason Momoa, Sam Smith.

Meyers (NBC at 1:07) Mark Wahlberg, Martin McDonagh.

Bethonie Butler