And this week's "Big Bang Theory" episode features none other than Leonard Nimoy. Well, the voice of Leonard Nimoy. Because Sheldon is convinced he's hearing the voice of the original Mr. Spock.
Meanwhile, on "Community," Britta, Pierce and Shirley try to shut down a sandwich shop that just opened in the cafeteria.
Elsewhere on TV ...
Missing (7 p.m., ABC/Ch. 4): Becca's friend complicates her search for her son.
American Idol (7 p.m., Fox/Ch. 13): Another contestant is eliminated.
Vampire Diaries (7 p.m., CW/Ch. 30): Damon and Stefan set out to destroy Klaus.
Men's college volleyball (7 p.m., BYUtv): Cal State-Northridge at BYU
Rules of Engagement (7:30 p.m., CBS/Ch. 2): Jeff plans a romantic scavenger hunt.
Person of Interest (8 p.m., CBS/Ch. 2): The latest person of interest is leading a double life.
Touch (8 p.m., Fox/Ch. 13): Martin discovers a homeless man has the same obsession with numbers that Jake has.
Secret Circle (8 p.m., CW/Ch. 30): A witch hunter appears, bringing a message.
Up All Night (8:30 p.m., NBC/Ch. 5): Reagan and Ava try to get Stevie Nicks on the show.
The Mentalist (9 p.m., CBS/Ch. 2): Jane runs into an old magician friend while investigating a murder.
Awake (9 p.m., NBC/Ch. 5): Michael is on the trail of a serial killer - and an FBI agent thinks Michael is the killer.