“Special Investigations Unit: Month of Mayhem” (7 p.m. today, CNN) offers a first-person account of the war in Iraq from correspondent Michael Holmes.

“Mayhem” follows Holmes with American troops and in Iraqi markets and takes place in and out of the “Green Zone.” In 2004, Holmes survived an ambush on his convoy, a skirmish that left two CNN staffers dead and one wounded.

¢ The family series “7th Heaven” (7 p.m. Sunday, CW) appears to have had nine lives over its 11 seasons. But tonight it all comes to an end. Careful “Heaven” fans will recall that the show seemed to have been canceled at the end of last season but returned to the schedule of the CW network, a combination of the WB and UPN.

But now it seems to be over. Or is it? In tonight’s episode, Annie (Catherine Hicks) and Eric (Stephen Collins) decide to celebrate his clean bill of health by embarking on a cross-country tour in an RV. But they’re not going alone. Lucy and Kevin and members of their extended family join them in the long, long trailer. Now if this doesn’t sound like an idea for a spin-off, what does?

Indeed, if the notion of an extended family on an extended road trip across America sounds familiar, it is. That was the plot to “Promised Land,” a CBS family drama from 1996 to 1999 starring Gerald McRaney (“Jericho”).

Today’s highlights

¢ “E! True Hollywood Story” (5 p.m., E!) glances at the “Dancing with the Stars” phenomenon.

¢ Scheduled on “Dateline” (7 p.m., NBC): A promising chemistry scholar goes from the lab to the slab.

¢ Robin and Little John lose a key supplier on “Robin Hood” (8 p.m., BBC America).

¢ Scheduled on “48 Hours Mystery” (9 p.m., CBS): the murder of an aspiring dancer.

¢ A the son of a famous model (Mariel Hemingway) dies of a mystery malady on “Law & Order” (9 p.m., NBC).

¢ Molly Shannon hosts “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest Linkin Park.

Sunday’s highlights

¢ Scheduled on “60 Minutes” (6 p.m., CBS): Internet real estate brokers; Mitt Romney; an Iraqi orphan’s ordeal.

¢ The voices of Mike Myers, Eddie Murphy and Cameron Diaz animate the computer-generated 2001 fairy-tale comedy “Shrek” (7 p.m., NBC).

¢ “Survivor” (7 p.m., CBS) wraps up its Fiji interlude with a two-hour finale and a one-hour (9 p.m.) retrospective.

¢ A serious health scare on “Desperate Housewives” (8 p.m., ABC).

¢ A dirty job comes between New Jersey and New York on “The Sopranos” (8 p.m., HBO).

¢ A big decision about the twins on “Brothers and Sisters” (9 p.m., ABC).

¢ Disease and hunger plague the realm on “The Tudors” (9 p.m., Showtime).

¢ A photographer documents her mother’s descent into mental illness in the film “Tierney Gearon: The Mother Project” (9 p.m., Sundance).