20/20, 9-11 p.m., Channels 9, 22.

When Barbara Walters became co-anchor to this show in 1984 she brought star power. She grabbed the big interviews.

Now Walters, 72, is stepping down from the show. Here, she looks back at 25 years of 20/20 interviews, including five years before she started anchoring.

We see her range. She's interviewed world leaders and celebrities; she's also interviewed such people as Monica Lewinsky and Donna Rice during their brief bursts of controversy.

Reba season-opener, 9 p.m., Channels 64, 26.

When this show began, Reba learned that her cheating husband, Brock, was leaving her for his dental hygienist. Now the fourth season opens with things in disarray.

Brock isn't sure which woman he prefers. Neither woman is sure she wants him, either. The result is inconsistent but includes enough laughs to keep us watching.

Worth watching

The Complex: Malibu, 8 p.m., Channels 19, 45. There are five couples left and one is about to be ousted.

What I Like About You season-opener, 8 p.m., Channels 64, 26. Holly returns from Europe with a hot British boyfriend; Vince and Henry are displeased. Meanwhile, her sister also has surprises.

Panic Room (2002), 8 and 10 p.m., TNT. Jodie Foster stars as a woman who hides with her daughter in her house's panic room as three home invaders (one of them Forest Whitaker) tries to get in.

Grounded for Life season-opener, 8:30 p.m., Channels 64, 26. Lily fumes because Brad romanced Lana (Mila Kunis of That '70s Show) at space camp. More complications come from Lily's mom's pregnancy.

8 Simple Rules, 8:30 p.m., Channels 9, 22. This rerun has Cate (Katey Sagal) hesitantly agreeing to a date the kids' principal (Adam Arkin), whom she knew long ago.

Joan of Arcadia, 9 p.m., Channels 12, 7. This show runs an hour later than usual to make room for Big Brother. In this rerun, Joan is feverish and feels God has given her contradictory instructions. Her parents also have key moments in their faith.

Third Watch season-opener, 9 p.m., Channels 5, 2. Last season, a mobster (Gene Simmons of the group Kiss) vowed to kill cops in general and Cruz (Tia Texada) in specific. Tonight, his men assault a hospital, leaving Bosco critically wounded.

Medical Investigation, 10 p.m., Channels 5, 2. It's a tough time for Dr. Connor (Neal McDonough). A Gulf War veteran, he's asked to study four recent Gulf soldiers who have a lethal pulmonary disease. That's complicated when elderly people at a convalescence home show the same symptoms. The case splits Connor further from his family.