Highlights 10/12-10/18

From frogfish to hagfish, learn the “Beauty of Ugly” in “Nature” at 7 p.m. Sunday.

Yasim suspects her late husband may have known what killed the woman found in Stephen’s apartment in the part two showing of “Last Enemy” in “Masterpiece Contemporary” at 8 p.m. Sunday.

Lynley & Havers are catapulted into the world of internet vice when they investigate a brutal death in “Masterpiece Mystery” at 9 p.m. Sunday.

“American Experience” at 8 p.m. Monday reassesses the life and political career of President Richard Nixon in a three hour special.

“Nova” at 7 p.m. Tuesday interviews with investigators and family members who give a new look at NASA and the Columbia space shuttle tragedy.

“Frontline” at 8 p.m. Tuesday examines the personal and political biographies of candidates John McCain and Barack Obama in “The Choice: 2008.”

“Chasing Churchill” at 10 p.m. Tuesday explores Churchill’s love for the United States and his relationship with President Roosevelt.

“Secrets of the Dead” at 7 p.m. Wednesday reveals the secretive, Cold War world of East German athletes who were given dangerous steroids.

Bob Schieffer of CBS moderates this seated debate focusing on foreign policy at Hofstra University in “PBS Newshour Debates 2008: Presidential” at 8 p.m. Wednesday.

“Austin City Limits” at 10p.m. Wednesday presents R&B veteran Bettye Lavette and classic blues pianist Pinetop Perkins.

U.S. Senator and Vice Presidential candidate Joe Biden speaks with Evan Smith on “Texas Monthly Talks” at 7 p.m. Thursday.

Community Docublogger Natasha Chen explores the fluctuating politics of Williamson County and Texas as a whole in “Docubloggers” at 7:30 p.m. Thursday.

“Texas Senatorial Debates” at 8 p.m. Thursday.

“Austin City Limits” at 7 p.m. Saturday features talented songwriter Lyle Lovett as he performs with acclaimed tunesmiths John Hiatt, Guy Clark and Joe Ely.