The Vampire Diaries (8pm, CW) - The fourth season ends on graduation day when ghosts overrun the town and try to settle old scores and fulfill their supernatural destinies.
The Big Bang Theory (8pm, CBS) - In the Season 6 finale, Peny and Sheldon are knocked for a loop when Leonard is offered a great job opportunity overseas.
American Idol (8pm, Fox) - The Top 10 singers reunite for a group performance before the Season 12 winner is announced.
The Office (8pm, NBC) - The farewell to "The Office" begins with a retrospective of the show, with interviews with writers, producers and actors, including John Krasinksi, Jenna Fischer, Rainn Wilson, Mindy Kaling and Paul Liberstein. The final episode, which airs at 9, jumps forward six months from last week's episode, and has past and present staffers gathering for Dwight and Angela's wedding. Then the Dunder-Mifflin workers are subjected to final interviews from the documentary film crew (even though the documentary aired six months prior -- I'm assuming they'll explain that.) Expect lots of special guest stars. The episode runs 75 minutes.
Elementary (9pm, CBS) - The two-hour Season 1 finale has Sherlock Holmes dealing with the sudden reappearance of his former lover, Irene Adler, and recalling the events that led to his drug addiction. All of this while Moriarty pursues Sherlock and Joan.
Grey's Anatomy (9pm, ABC) - In the ninth season finale, a severe storm rages outside and the hospital's resources become limited as more storm victims arrive. And of course, one doctor's life will be in jeopardy.
Beauty and the Beast (9pm, CW) - Secrets about Cat's family are revealed in the Season 1 finale. Later, Gabe takes drastic measures. Way to be vague, CW!
Scandal (10pm, ABC) - In the Season 2 finale, Olivia's team members are in peril as the mole's real identity is about to surface. Also, Cyrus has trouble managing the pressure of the most recent White House crisis.
Hannibal (10:15, NBC) - Because of tonight's 75-minute episode of "The Office," NBC is running "Hannibal" with limited commercial interruptions. In the latest installment, a killer exposes his victim's vocal cords in a murderous attempt to gain Hannibal's attention. Also, Will struggles with bizarre noises in his head, and Hannibal visits his own therapist to discuss his relationship with Will.