PBS (Channel 7) tackles the issue of guns in four programs. After Newtown: Guns in America (8 p.m. Tuesday) tracks the evolution of guns in this country. Frontline (9 p.m. Tuesday) profiles Newtown shooter Adam Lanza, below. Nova (8 p.m. Wednesday) goes inside the "Mind of a Rampage Killer." And The Path to Violence (9 p.m. Tuesday) reports on efforts to help schools detect problem behavior. The Week Ahead

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Dallas

An old enemy resurfaces; Ryland continues to try to destroy Ann's life.

Watch • 7 p.m. Monday, TNT

Cult

This show-within-a-serial killer-show is sort of a confusing mess, but Utahn Matt Davis is very good in the lead.

Watch • 8 p.m. Tuesday, Channel 4

The Americans

When a gunman wounds President Reagan, Stan tries to find out if the KGB was involved in the assassination attempt.

Watch • 11 p.m. Wednesday, FX

Grey's Anatomy

The doctors try to save the hospital by meeting with a possible investor.

Watch • 8 p.m. Thursday, Channel 4 This Weekend

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Beyoncé: Life Is but a Dream

The singer is profiled in this documentary.

Watch • 10 p.m. Saturday, HBO

NBA All-Star Game

Live from Houston.

Watch • 6 p.m. Sunday, TNT

The Simpsons

Marge tries to save Maggie from the dangers of TV.

Watch • 7 p.m. Sunday, Channel 13

The Good Wife

It's Will and Diane vs. Cary and Alicia in a mock trial.

Watch • 8 p.m. Sunday, Channel 2

Revenge

Someone is about to die on Jack's boat.

Watch • 8 p.m. Sunday, Channel 4

Downton Abbey

Whoops. Last week wasn't the Season 3 finale after all. This week is. Really. There's a trip to Scotland, a birth and a shocking conclusion.

Watch • 8 p.m. Sunday, Channel 7