What's New Tonight: Thursday, May 16th.

8:00 PM EST:

“American Idol” on FOX. Season 12 Finale. The winner is finally announced after the Top 10 reunite for a group performance.

“The Big Bang Theory” on CBS. Season 6 Finale. Leonard is offered a wonderful job overseas, which takes Penny and Sheldon by surprise.

“The Vampire Diaries” on The CW. Season 4 Finale. Ghosts overrun the town on graduation day, hoping to settle old scores and fulfill their supernatural destinies. Elena makes her decision regarding the Salvatore brothers and confronts Katherine. Stefan learns a horrifying secret about Silas.

9:00 PM EST:

“Beauty and the Beast” on The CW. Season 1 Finale. Secrets about Cat’s family arise. Gabe takes some drastic measures.

“Elementary” on CBS. Season 1 Finale. Holmes deals with the sudden reappearance of his lost lover, and recalls the chain of events that led him to addiction. Moriarty pursues Sherlock and Joan.

“Grey’s Anatomy” on ABC. Season 9 Finale. A doctor’s life is in jeopardy. A severe storm hits the town, and the hospital’s resources are dwindling as more victims arrive.

“The Office” on NBC. Series Finale. Past and present staff members gather for a wedding, including Mindy Kaling, B.J. Novak, Joan Cusack, Ed Begley Jr., Rachael Harris, Dakota Johnson, Andy Buckley, and Malcolm Barrett.

10:00 PM EST:

“Hannibal” on NBC. A killer attempts to gain Hannibal’s attention. Will struggles with odd noises in his head and grows closer to Alana. Hannibal talks to his therapist about his relationship with Will.

“Scandal” on ABC. Season 2 Finale. The Mole’s real identity is about to surface, putting Olivia’s team in peril. Cyrus has trouble handling the latest White House crisis.