SERIESNCIS: Dina Meyer reprises her guest role as Washington, D.C., madam Holly Snow in this new episode (8 p.m. CBS).
Dancing With the Stars: Country music's Reba McEntire performs on the results show (8 p.m. ABC).
American Idol: The top nine take a crack at the songs of Lennon and McCartney (8 p.m. Fox).
NOVA: The science series presents "Hunting the Edge of Space: The Mystery of the Milky Way" (8 p.m. KCET).
Southland: The police drama about the men and woman of the LAPD ends its second season (10 p.m. TNT).
Paris Hilton's British Best Friend: The celebutante seeks companionship across the pond in this new reality competition (10 and 11 p.m. TV Guide).
SPECIALSAwesome Pawsome 2: The Next Generation: Wildlife experts work with the rare Sumatran tiger (8 p.m. Animal Planet).
The Cast of Friends: Where Are They Now: This new special catches up with the stars of the hit sitcom (8 p.m. TV Guide).