Critic’s Corner

Meteor 9 p.m., Channel 7

Marla Sokoloff and Stacy Keach (above) star in this two-part disaster miniseries, which finds a meteor heading straight toward Earth.

Miss Marple: Murder Is Easy 9 p.m., Channel 2

In this new “Masterpiece Mystery!’’ episode, Miss Marple looks into murders in a small village. Julia McKenzie stars.

Merlin 8 p.m., Channel 7

Morgana becomes seriously ill.

Expedition Africa 10 p.m., History Channel

Going to Malagarasi.

Army Wives 10 p.m., Lifetime

An injured Iraqi orphan.

In Plain Sight 10 p.m., USA

Raphael’s mother visits.

Spectacle: Elvis Costello With. . . 9 p.m., Sundance Channel

Bill Clinton.