“The Big Bang Theory” (CBS, 8 p.m.): Could Leonard (Johnny Galecki) be tempted to move to another country? How about another star system?
“The Vampire Diaries” (CW, 8 p.m.): Ghosts overrun Mystic Falls (think “zombies,” but much harder to kill).
“The Office” (NBC, 9 p.m.): Nine glorious seasons wrap, with a farewell reunion. Will Michael Scott (Steve Carell) or won’t Michael Scott make one last humiliating faux pas?
“Grey’s Anatomy” (ABC, 9 p.m.): A superstorm hit Grey Sloan Memorial in the penultimate episode; what’s left for the finale? A tsunami?
“Elementary” (CBS, 9:01 p.m.): The worthy freshman will see “Nurse Jackie’s” Dominic Fumusa turn up in a cameo playing a bodyguard with “secrets.”
“Scandal” (ABC, 10:02 p.m.): Olivia (Kerry Washington) and her team find themselves in an increasingly dangerous situation.
“The Middle” (ABC, 8 p.m.): Marion Ross from “Happy Days” is here, playing an elementary school vice principal.
“Modern Family” (ABC, 9 p.m.): The gang flies to Florida after the death of Phil’s (Ty Burrell) mom, but an outstanding arrest warrant awaits Gloria (Sofia Vergara) in the Sunshine State.
“Nashville” (ABC, 10 p.m.): Brad Paisley — who just recorded a controversial single with LL Cool J — makes a guest appearance.