1) “Schitt’s Creek” (shown here), 9 p.m., Pop (rerunning at 12:30 a.m., after last week’s episode at midnight). In the final season, dreams extend beyond this tiny town. Johnny wants to buy a second motel; his son David wants to be a flight-attendant … a dream he stole from Stevie. It’s a funny episode that starts with a reminder: It’s difficult to have video-sex when a sharing a motel room with your brother and parents.
2) “Arrow” and “Legends of Tomorrow,” 8 and 9 p.m., CW. Last week, Oliver Queen (the Green Arrow) died yet again; this time, we’re told, it’s permanent. Tonight, we get a peek at what could become a female-centered spin-off: In 2040, Mia Queen (Oliver’s daughter) is rich, beautiful … and not interested in the superhero business. Then Laura and Dinah arrive with a mission. It’s a high-octane episode, prior to next week’s series finale; a light, fun “Legends” follows, with a pseudo-documentary.
3) “The Conners,” 8 p.m., ABC. After five Tuesdays without a new episode (two of them usurped by the “Jeopardy” tournament), this excellent show is back. Becky’s new boyfriend is a devout Christian; that’s his right, of course, but he offends the family in another way: He’s a Green Bay Packer fan.
4) “Project Blue Book” season-opener, 10:03 p.m., History.The first season was a ratings success, with an Ohio State professor linking with an Air Force captain, to probe UFO’s in the 1950s. Its final three episodes rerun from 7-10 a.m., followed by six hours of UFO documentaries. Later, the new season starts in ‘53: Someone from Roswell, N.M., threatens to tell about a crash there, six years earlier.
5) “The Godfather” (1972), 8 p.m., AMC. One of the all-time best films leads a great movie night, followed by its sequel at midnight. Other top choices include the smart “Good Will Hunting” (1997) at 6:52 p.m. on Starz and the thoroughly entertaining “Red” (2010) at 6 p.m. on TNT, with its sequel at 8.