Critic's Corner

Former "American Idol" finalist David Archuleta (above) guest stars on the show. He and Miley Cyrus perform a song together.

In Treatment 9 and 9:30 p.m., HBO

The series enters week five tonight, with two episodes. Mia and April are the scheduled clients.

Brothers & Sisters 10 p.m., Channel 5

Kitty considers calling a divorce lawyer.

In Plain Sight 10 p.m., USA

Former "Lost"-ie Cynthia Watros guests.

The No. 1 Ladies' Detective Agency 8 p.m., HBO

A rival agency opens.

The Amazing Race 14 8 p.m., Channel 4

In Beijing.

Celebrity Apprentice 9 p.m., Channel 7

The teams write a jingle for tuna fish.