Critic's picks

By Matthew Gilbert, Globe Staff  |  July 5, 2009

Miss Marple: A Pocketful of Rye 9 p.m., Channel 2

Actress Julia McKenzie (above) takes over the role of Miss Marple in this new four-episode series of “Masterpiece Mystery!’’ Tonight, she investigates the murder of a businessman, his wife, and their maid.

Merlin 8 p.m., Channel 7

In this episode of the British series about the origins of Camelot, the brave Lancelot saves Merlin from a flying creature that is terrorizing a village.

Iron Chef America 10 p.m., Food Network

Sue Torres vs. Bobby Flay.

Army Wives 10 p.m., Lifetime

Roxy puts together a party to reopen the bar.

Jesse James Is a Dead Man 10 p.m., Spike TV

He navigates a minefield.

Million Dollar Password 8 p.m., Channel 4

Betty White and Adam Carolla.

Expedition Africa 10 p.m., History Channel

The team goes to Tambora.