What to Watch on Thursday, May 19

Your daily guide to the most interesting stuff happening on TV and streaming. All times Eastern.

PICK OF THE NIGHT

The 100

The CW, 9 p.m.

How far will Clarke go to defeat A.L.I.E.? Maybe as far as the much-ballyhooed City of Light? That seems to be where things are heading in the series, which ends its third season tonight.

SEASON FINALE

Grey’s Anatomy

ABC, 8 p.m.

Per tradition, Grey’s Anatomy goes out big with a finale event that some would call an important day for Amelia, with sisters Meredith and Maggie on hand to help her through it. Okay, fine, we’ll stop playing coy — it’s a wedding, duh. Check out our preview of the finale here for more intel.

SEASON FINALE

The Blacklist

NBC, 9 p.m.

The James Spader drama ends the season the only way it knows how: with a shocking betrayal.

STARRY NIGHT

The Graham Norton Show

BBC America, 11:30 p.m.

Only the A-listers for Norton, thank you very much: Jennifer Lawrence, James McAvoy, Johnny Depp, Jack Whitehall, and will.i.am will all grace the Brit’s couch.

CLOWN CAR

The Tonight Show Starring Jimmy Fallon

NBC, 11:35 p.m.

Tonight, Fallon brings in the clowns: Seth Rogen promotes Neighbors 2 as the first guest, while Fred Armisen promotes Fred Armisen as the second guest. The musical guest is Corinne Bailey Rae.