Matters of the heart

“Christiane Amanpour: Sex & Love Around the World” gives the renowned foreign correspondent a chance to sharpen her skills on more amorous matters than international conflict — although the host won’t be tucking away her passport. The six-part series, executive-produced by Anthony Bourdain, has Amanpour discussing modern love everywhere from Accra to Shanghai.

9 p.m. Saturday, CNN

Gandalf meets his match

Stewie seeks therapy from Sir Ian McKellen in a commercial-free episode of “Family Guy” that sets viewers up for a very special, heartwarming episode — before taking the darkest of turns. McKellen is a good sport throughout, although he falls short of matching buddy Patrick Stewart’s sidesplitting sendup of himself on Ricky Gervais’ “Extras.”

8 p.m. Sunday, KMSP, Ch. 9

A search for justice

“Unmasking a Killer” serves as a proper companion piece to the new book “I’ll Be Gone in the Dark,” by the late Michelle McNamara. Both the five-part documentary and the author, who was Patton Oswalt’s wife, shed light on the manhunt for the Golden State Killer, an elusive terror believed to have committed more than 50 sexual assaults and 10 murders from 1976 to 1986.

8 p.m. Sunday, HLN