Host Mike deGruy dons an outfit straight out of “Star Trek” to search for the “Perfect Shark” (8 p.m., Discovery). Mike’s aquarium time machine takes us back to the era of the long-extinct megalodon, which grew to 60 feet in length, making it the largest shark ever known.

¢ A perfume-counter clerk falls for a neurotic American comedy writer in the British comedy “Love Soup” (9 p.m., BBC America), an earnest attempt to rekindle the talky, bittersweet romantic comedy in the Woody Allen vein. And like many such comedies of the past three decades, it is far more self-absorbed than funny.

¢ “Queer Eye” (9 p.m., Bravo) embarks on a makeover that transcends clothes, hair and makeup. Born Amelia and raised in rural Vermont in a religious household, she began calling herself Miles in college and has taken hormones to pass as a man. The gang offers advice to help Miles feel comfortable in a transformed identity.

Tonight’s other highlights

¢ Exhibitionists under wraps on “Big Brother: All Stars” (7 p.m., CBS).

¢ On back-to-back episodes of “House” (Fox), role-playing takes its toll (7 p.m.), a sterile room proves anything but (8 p.m.).

¢ On back-to-back episodes of “Gilmore Girls” (WB), Luke’s past returns (7 p.m.), Carole King guest stars (8 p.m.).

¢ Angela Lansbury discusses her life and career on “Private Screenings” (7 p.m., TCM), followed by her great performance in the 1962 satire “The Manchurian Candidate” (8 p.m., TCM).

¢ Many are called, few are chosen on “The One: Making a Music Star” (7:30 p.m., ABC).

¢ Talents vie for a meteoric rise on “Rock Star: Supernova” (8 p.m., CBS). Was Comet approached as a sponsor?

¢ Auditions continue on “Last Comic Standing” (8 p.m., NBC).

¢ Cesar shares moments with his pack of more than 50 canine companions on “Dog Whisperer: Power of the Pack” (8 p.m., National Geographic).

¢ Scheduled on “48 Hours Mystery” (9 p.m., CBS): new evidence about the night Marilyn Monroe died in 1962.

¢ A T-shirt may be linked to an abandoned infant on “Law & Order: Special Victims Unit” (9 p.m., NBC).

¢ Michael J. Fox stars as a pharmaceutical CEO under investigation on “Boston Legal” (9 p.m., ABC).

¢ “P.O.V.” (9 p.m., PBS, check local listings) looks at life, crime and clashing cultures on the U.S. border with Mexico.

¢ Smoke inhalation and more on “Rescue Me” (9 p.m., FX).

Late night

Bosworth and Broken Social Scene appear on “Late Show with David Letterman” (10:35 p.m., CBS) … Jay Leno hosts Lisa Kudrow and Wolfmother on “The Tonight Show” (10:35 p.m., NBC) … Sandra Oh and Jewel appear on “Jimmy Kimmel Live” (11:05 p.m., ABC) … Will Ferrell is scheduled on “Late Night with Conan O’Brien” (11:35 p.m., NBC) … Craig Ferguson hosts Bonnie Raitt on “The Late, Late Show” (11:37 p.m., CBS).