20 Years of Monty Python's Flying Circus (6 p.m., BBC-America): Steve Martin hosts this retrospective.

The Fairly Oddparents (6:30 p.m., Nick): Leave it to Nickelodeon to come up with another demented cartoon series that's going to appeal to kids. In this one, a 10-year-old boy acquires two semi-competent fairy godparents who make his life amazingly difficult.

Diagnosis Murder (7 p.m., Ch. 2): A murder is tied to a new-age religious cult popular with Hollywood stars.

Providence (7 p.m., Ch. 5): A visitor may have brought the Ebola virus from Africa.

Aaron Carter and Samantha Mumba in Concert (7 p.m., Disney): Kids will enjoy these performances by the teen stars.

Invader Zim (7 p.m., Nick): Another offbeat, entertaining, animated series from Nickelodeon — this one about a bug-like alien who's so annoying he's sent to Earth to get him out of the way — and who infiltrates an elementary school.

Farscape (7 and 10 p.m., Sci Fi): Moya is linked to another living spaceship.

Popstars (7:30 p.m., Ch. 30): The group hits the road to promote their new CD.

The Fugitive (8 p.m., Ch. 2): Kimble chases the one-armed man to San Francisco.

Who Wants to Be a Millionaire (8 p.m., Ch. 4): Salt Lake's Bill Brennan makes it to the hot seat.

Dateline (8 p.m., Ch. 5): Internet baby-selling scams.