"Twins" (8:30 p.m., the WB): Contrasting twin sisters (Sara Gilbert and Molly Stanton) take over

"Twins" (8:30 p.m., the WB): Contrasting twin sisters (Sara Gilbert and Molly Stanton) take over their parents' lingerie business but find the transition anything but smooth. They're stereotyped as "brains" and "beauty," and Mom and Dad (Melanie Griffith and Mark Linn-Baker) just don't want to get out of the way. This new comedy series is from the producers of "Will & amp; Grace."
"Threshold" (9 p.m., CBS): A "mysterious craft" lands in the middle of the Atlantic Ocean, and soon the future is looking bleak for everybody. But, we're told, there's hope -- "a team of experts" rushes to investigate. The cast of this new drama series includes Carla Gugino, Charles S. Dutton, Brian Van Holt and Brent Spiner.
"Crossroads" (10:30 p.m., CMT): In a new edition of the show that pairs country acts with stars from other genres, Bon Jovi and the hot country trio Sugarland join forces for a show at New York's Hammerstein Ballroom. Selections include "Who Says You Can't Go Home?" a collaboration that is part of Bon Jovi's latest album, due in stores next week.
"What I Like About You" (8 p.m., WB): Val and Vic wake up with a hangover and wedding rings. Bad combo.
"Reba" (9 p.m., WB): Reba takes a pill, which is long overdue if you've ever seen her in action.