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Quick quiz — which of the following candidates will not be at tonight's Democratic presidential debate (6:30 p.m. CNN)?

Joe Biden, Lincoln Chaffee, Hillary Clinton, Martin O'Malley, George Pataki, Bernie Sanders or Jim Webb?

It's a trick question. Biden isn't a candidate. And Pataki is a candidate, but the former governor of New York is a Republican … who you may never have heard of. Just the way you may never have heard of Lincoln Chaffee or Jim Webb.

Elsewhere on TV ...

Baseball playoffs: St. Louis Cardinals at Chicago Cubs (2:30 p.m., TBS); Los Angeles Dodgers at New York Mets (6 p.m., TBS)

"NCIS" (7 p.m., CBS/Ch. 2): A murder case is connected to a former NCIS agent Vance locked up.

"The Muppets" (7 p.m., ABC/Ch. 4): The gang performs karaoke with Ed Helms at Rowlf's Tavern.

"The Voice" (8 p.m., NBC/Ch. 5): The battle round continues.

"Mary Tyler Moore: A Celebration" (7 p.m., PBS/Ch. 7): A celebration of "The Mary Tyler Moore Show."

"Grandfathered" (7 p.m., Fox/Ch. 13): When Jimmy realizes that he doesn't know much about Gerald, he decides to take him out for a night on the town.

"The Flash" (7 p.m., CW/Ch. 30): Jay Garrick (guest star Teddy Sears) appears at S.T.A.R. Labs with a dire warning about an evil speedster named Zoom.

"Manhattan" (7 p.m., WGN): William Petersen ("CSI") joins the cast in the Season 2 premiere.

"Fresh Off the Boat" (7:30 p.m., ABC/Ch. 4): Louis tries to make Eddie's first school dance like something out of a John Hughes movie.

"The Grinder" (7:30 p.m., Fox/Ch. 13): Dean meets a woman who isn't at all impressed by his celebrity

"NCIS: Los Angeles" (8 p.m., CBS/Ch. 2): The team must determine why a murdered Navy drone pilot was using a black market drone.

"Marvel's Agents of S.H.I.E.L.D." (8 p.m., ABC/Ch. 4): Daisy, Mack and Coulson try to protect Lincoln from Rosalind's team.

"Secrets of the Dead" (8 p.m., PBS/Ch. 7): The truth behind the story of the Trojan horse is uncovered by a team of historians, military engineers and archaeologists.

"Scream Queens" (8 p.m., Fox/Ch. 13): With Halloween just days away, Dean Munsch makes an announcement affecting Chanel's plan to throw a pumpkin patch party.

"iZombie" (8 p.m., CW/Ch. 30): Liv and Detective Babineax investigate the murder of a hard-partying frat boy.

"Public Morals" (8 and 9 p.m., TNT): Muldoon puts Shea to the test; Rusty and Kay spend quality time together; Fortune's mother arrives in town; Kane returns to Hell's Kitchen..

"Limitless" (9 p.m., CBS/Ch. 2): Brian's loyalty to the FBI is tested when a representative for Eddie Morra demands he steal secret files on NZT.

"Chicago Fire" (9 p.m., NBC/Ch. 5): Casey goes undercover to bring down a trafficking ring being run out of Nesbitt's club.

"Frontline" (9 p.m., PBS/Ch. 7): In the conclusion of a three-part report, "Frontline" producer Ken Dornstein's investigation of the 1988 bombing of Pan Am Flight 103 over Lockerbie, Scotland, uncovers information about a possible Lockerbie bomb-maker, whom he attempts to contact.

"The Bastard Executioner" (11 p.m., FX): Wilkin and Toran get a new timeline for their revenge.