1) “The Blacklist” season-opener, 8 p.m., NBC. This intense drama peaked as its eighth season ended: Red (James Spader, shown here in a previous episode) told Liz (Megan Boone, who was leaving the show) to shoot him and then read a letter revealing his secrets. Instead, a gunman killed her; Red killed him and fled. Now we jump ahead two years. Red vanished, the task force folded, but a new threat brings them back together.
2) “Law & Order: Special Victims Unit,” 9 p.m., NBC. It’s another milestone for “SVU,” the longest-running primetime drama in TV history. Now it has its 500th episode. That includes the return of Nick Amaro, a detective who left seven years ago, after being wounded. He’s played by Danny Pino, who went on to impressive work in “Mayans, M.C.” and the “Dear Evan Hansen” movie musical.
3) “Ghosts” (9 p.m., CBS) and “What We Do in the Shadows” (10 p.m., FX, rerunning at 10:38 and 11:16). As TV overloads with Halloween fear, we need to remember that ghosts and vampires can be fun. On CBS, Sam and Jay invite their nosy neighbors (Mark-Linn Baker and Kathryn Greenwood) to dinner, hoping they won’t block plans for a bed-and-breakfast; the ghosts soon complicate things. On FX, Colin (the dreary “energy vampire”) has a birthday and one of the vampires leaves.
4) “B Positive,” 9:30, CBS. After a strong first year, this changed drastically in last week’s season-opener. Gina suddenly inherited $48 million … shortly after Drew realized he loves her. Now that gets complicated when his girlfriend (recast as Michelle Ortiz) returns from her cancer treatment in Europe.
5) “Coroner” season-finale, 8 p.m., CW. This well-made series wraps with Jenny (a coroner) and Mac (a police detective) following a killer to a dangerous location. And after this? The show has been renewed for a fourth season in Canada, but the CW has been slow to announce a decision.