Who would have ever thought that one of the geeks on The Big Bang Theory (7 p.m., CBS/Ch. 2) would get married? Or that Howard (Simon Helberg) would be the first of the guys to tie the knot?
That is, however, what's happening tonight. Because of Howard's rescheduled mission to the International Space Station, he and Bernadette (Melissa Rauch) have moved up their wedding. And the gang rushes to get things ready.
Among the guests is real-life astronaut Mike Massimino, who also appeared in an episode back in February.
This is the season finale, so don't be surprised if there's some sort of cliffhanger.
Elsewhere on TV ...
Missing (7 p.m., ABC/Ch. 4): Dax learns who his enemies are.
Community (7 p.m., NBC/Ch. 5): Abed is convinced that Dean Pelton is an imposter.
American Idol (7 p.m., Fox/Ch. 13): Another hopeful is eliminated.
The Vampire Diaries (7 p.m., CW/Ch. 30): Jeremy makes a life-changing decision. (Season finale)
30 Rock (7:30 p.m., NBC/Ch. 5): Avery is back, and Jack is suspicious.
Person of Interest (8 p.m., CBS/Ch. 2): Reese learns something about Finch's past.
Grey's Anatomy (8 p.m., ABC/Ch. 4): The residents decide where they're going to work.
The Office (8 p.m., NBC/Ch. 5): A former boss helps Andy mount a coup. (Season finale)
Touch (8 p.m., Fox/Ch. 13): Martin tries to expose a corrupt parole officer.
The Secret Circle (8 p.m., CW/Ch. 30): Jake, Melissa and Adam try to save Faye from the witch hunters. (Season finale)
Parks and Recreation (8:30 p.m., NBC/Ch. 5): Leslie awaits the election results. (Season finale)
The Mentalist (9 p.m., CBS/Ch. 2): Jan gets a message from Red John.
Scandal (9 p.m., ABC/Ch. 4): A series of flashbacks show how Olivia came to work for the president and how she later assembled her team.
Awake (9 p.m., NBC/Ch. 5): An unusual dream disrupts Britten's ability to switch realities.