ABC presents “Titanic” (7 p.m. Saturday, concludes Sunday), a lush, expensive four-hour miniseries. Written by Julian Fellowes (“Downton Abbey”) and starring Linus Roache (“Law and Order”) and Geraldine Somerville (“Harry Potter” franchise), “Titanic” continues Fellowes’ penchant for exploring England’s social strata. And what’s a better setting than an ocean liner divided into first, second and steerage classes?

A passably entertaining combination of “Downton” and James Cameron’s “Titanic,” it’s hardly “A Night to Remember” (9 p.m. Saturday, TCM). ABC’s “Titanic” lacks the nuanced intimacy of “Downton” and its attention to minute period details. At the same time, it’s highfalutin enough to avoid the soap opera obviousness of the soggy 1997 saga of Jack and Rose.

At best, this “Titanic” follows Cameron’s style, using the historic tragedy to show off the bells and whistles of digital imagery. It doesn’t exactly capsize, but I’m not sure how many will stick around to see who makes it to the lifeboats.

Tonight’s other highlights

• The adventures of “Avatar: The Last Airbender” continue on “The Legend of Korra” (10 a.m., Nickelodeon).

• NASCAR action at the Samsung Mobile 500 (6 p.m., Fox).

• Jeff Bridges narrates “Hunger Hits Home” (7 p.m., Food), a look at malnutrition in America.

• The two-part miniseries “The Sinking of the Laconia” (9 p.m., Ovation) recalls the sinking of a British troopship by a German U-boat in World War II.

• Josh Brolin hosts “Saturday Night Live” (10:30 p.m., NBC), featuring musical guest Gotye.

Cult choice

Like “Atonement,” the 1948 drama “The Fallen Idol” (7 p.m. Saturday, TCM) focuses on the shaky testimony of a disillusioned child.

Saturday series

Mac recalls a day of tragedy on “CSI: NY” (7 p.m., CBS) … “Escape Routes” (7 p.m., NBC) … Mitch is miffed on “The Firm” (8 p.m., NBC) … Homicide on “48 Hours Mystery” (9 p.m., CBS) … International intrigue on “Law & Order: Special Victims Unit” (9 p.m., NBC).