Best Bets on TV Tonight

“Planman” (8 p.m., BBC America): A lawyer with a midlife crisis moonlights as a crook. Insert your own joke here, please.

“Desperate Housewives” (9 p.m., ABC): It looks like the jig is up for on-the-sly lovers Gaby and Carlos as Victor confronts his wife about the affair. Also, Bree tells Susan that she suspects Mike may be up to something no good.

“A Global Warning?” (9 p.m., History Channel): The climate shifts that bring us frigid Aprils and summery Octobers are nothing new for the planet: Earth has been a product of extreme makeovers throughout its 600-million-year journey. This new special traces the climate swings, as scientists work to prevent climate catastrophe by understanding past weather patterns. Experts discuss how the Arctic Ocean was once tropical, why million-year-old frozen methane gas from the ocean floor could raise global temperatures upon melting, and how a cave’s fossil records illustrate that entire species have vanished from Earth.

“It Was One of Us” (9 p.m., Lifetime): Five women, former college roommates, hold a weekend reunion years after graduation in this original movie. They reminisce about their campus days, and each reveals a dark secret to the group. A week later, each receives a note demanding payment in exchange for not exposing her secret. Jealousies and suspicions begin to unravel the friendships as each takes a closer look at the others’ lives.