BEST BETS
• Grey’sAnatomy marks a milestone with its 300th episode. Some familiar faces from the show’s past are likely to reappear as the doctors treat victims of a roller coaster accident, sparking memories of those who have come and gone in the medics’ own lives. (CTV at 7; ABC 38 at 8) • The Narrows becomes a showplace for Grundy and Nygma in a new episode of Gotham, but Penguin isn’t happy to find himself the object of Nygma’s humour. He recruits the Sirens to help him get even. Gordon receives an offer of a promotion, prompting a bad reaction from Bullock. (Fox 14 at 8; CTV at 9:01) • On a new episode of Supernatural, Billie’s (guest star Lisa Berry) surprising return coincides with Sam and Dean’s crusade against a mad doctor’s ghost. She has more surprises in store, since there’s something noticeably different about her. The brothers also have another reunion, this one with Castiel. (Space, CW 32 at 8; KTLA at 11) • As the town buzzes with gossip about the shooting at the dam, teenager Dessie Toner, who apparently committed suicide, remains the main suspect behind the murders, although the boy’s mother insists he was manipulated by Craig Petrie on a new TheLoch. Annie suspects the killer is still at large. (CBC 20 at 9) • Heightened discord between Ed and Kelly, prompted by someone they know who boards the Orville, doesn’t help their assignment to facilitate a peace treaty in a new episode of TheOrville. Elsewhere, Yaphit (voice of Norm Macdonald) makes his affection for Dr. Finn known. (City 44, Fox 14 at 9:01) LATE NIGHT Noah at 11 & 12:05: Author Van Jones (N). Colbert at 11:35: Kimmel at 11:35: Josh Hutcherson, Dale Earnhardt Jr., Dan Auerbach performs (N). Fallon at 12:05: Corden at 12:37: Actor Gael García Bernal, actor Jason Momoa (N). Meyers at 1:07: Mark Wahlberg, playwright Martin McDonagh, Nathan Davilmar (N). Conan at 1:37: Actors Will Ferrell, Mark Wahlberg, Mel Gibson and John Lithgow (N).