"Big Brother" (8 p.m., CBS): Behold the cockroach of TV: You just cannot eradicate it. Summer's guiltiest pleasure returns with a whole new batch of roomies who will try to get along with each other -- and fail miserably. We can only hope that it's devoid of "casual racism" this time around.
"Mystery Girls" (8:30 p.m., ABC Family): Reunited and it feels so good. "Beverly Hills 90210" alums Jennie Garth and Tori Spelling are back together in this crazy comedy. They play 1990s TV detectives who join forces to solve real crimes. Sounds almost as goofy as some of those old "90210" plot lines.
"Taxi Brooklyn" (10:01 p.m., NBC): Chyler Leigh stars in the new action drama. She plays a detective who speeds around New York solving crimes with the help of a local cabbie (Jacky Ido).
Also on Wednesday: