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In tonight's episode of "The Big Bang Theory" (7 p.m., CBS/Ch. 2), Leonard and Sheldon go dress shopping with Penny and Amy.

If that doesn't destroy their relationships, nothing will.

Elsewhere on TV ...

"The Taste" (7 p.m., ABC/Ch. 4): Contestants have to create ceviche, tacos and more.

"The Biggest Loser" (7 p.m., NBC/Ch. 5): Contestants get makeovers from fashion guru Tim Gunn and hairstylist Ken Paves.

"American Idol" (7 p.m., Fox/Ch. 13): Auditions continue.

"Project Runway All Stars" (7 p.m., Lifetime): Contestants have to create bathing suits and resort wear.

"Mom" (7:30 p.m., CBS/Ch. 2): Christy meets her single neighbor (Colin Hanks).

"Two and a Half Men" (8 p.m., CBS/Ch. 2): Herb asks Alan's permission to go on a date with Lyndsey.

"Bad Judge" (8 p.m., NBC/Ch. 5): A hacker posts an incriminating photo of Rebecca.

"Portlandia" (8 p.m., IFC): In the Season 5 premiere, a flashback to 1991 features an incident involving Toni and Candace.

"The McCarthys" (8:30 p.m., CBS/Ch. 2): Marjorie's overly competitive sister visits.

"A to Z" (8:30 p.m., NBC/Ch. 5): Andrew and Zelda try to find some time alone with little success.

"Elementary" (9 p.m., CBS/Ch. 2): Watson and Holmes search for a missing nurse who was one of Joan's former co-workers.

Parenthood (9 p.m., NBC/Ch. 5): The family anxiously awaits news about Zeek's condition.

Men's college basketball (9 p.m., ESPNU): Pepperdine at BYU