Today on TV

Big Brother 6 (7 p.m., Ch. 2): CBS is trying a few things to mix things up this season — a new house; two contestants with a secret, prior relationship — but we're in for the same sort of lowbrow, prurient voyeurism that makes this one of the more distasteful "reality" shows.

Reign of Fire (7 p.m., Ch. 4): The current Batman, Christian Bale, battles dragons in this 2002 movie. Oh, yeah, Matthew McConnaughey is in it, too.

Joey (7 and 7:30 p.m., Ch. 5): Joey joins a book club; Joey tries to be several places at once. (Repeat)

Will & Grace (8 and 8:30 p.m., Ch. 5): Debbie Reynolds, Alan Arkin, Lee Majors and Molly Shannon guest star in a pair of repeats.

CSI (8 p.m., Ch. 2): Murders are tied to a ring marketing Russian mail-order brides. (Repeat)

ER (8:59 p.m., Ch. 5): Frances Fisher guest stars as Kerry Weaver's birth mother. (Repeat)

Without a Trace (9 p.m., Ch. 2): An heiress disappears. (Repeat)