Where would the women’s network be without bad girls or femme fatales? Brooke Burns (“Baywatch”) stars as the conniving other woman in “A Sister’s Revenge” (7 p.m. Saturday, Lifetime). Michael Miller (Tim Rozon) has put his wild ways behind him. The former Lothario has settled down with a wife and baby and is focused on running the hottest new restaurant in town.

Too bad for Michael, Suzanne Dunne (Burns) has her eye on him, and she’s put her home-wrecking engine into overdrive. The real mystery here is just what motivates our bombshell. Is it love? Lust? Or vengeance?

Saturday’s highlights

• NASCAR action in the Toyota Owners 400 (6 p.m., Fox).

• “Mayweather” (7 p.m., CBS) profiles professional boxer Floyd Mayweather Jr.

• Our hero has only a half hour to rescue Clara on “Doctor Who” (7 p.m., BBC America). Good thing it’s an hourlong show.

• Jimmy makes waves on “Smash” (8 p.m., NBC).

• New clues about the cloning experiment emerge on “Orphan Black” (8 p.m., BBC America).

• Forest creatures delight in teasing the encroaching suburbanites in the 2006 animated comedy “Over the Hedge” (8 p.m., ABC), featuring the voices of Bruce Willis, Garry Shandling, Steve Carell, William Shatner and Allison Janney.

• Rachel Hunter and Brad Dourif — as you’ve never seen them before — star in the 2012 shocker “Swamp Volcano” (8 p.m., Syfy).

• Scheduled on “48 Hours” (9 p.m., CBS): murder, most likely.

• Joseph Gordon-Levitt, Gillian Jacobs, Paul Scheer and Rob Huebel appear on “The Nerdist” (9 p.m., BBC America).

• “Outrageous Acts of Science” (9 p.m., Science) looks at “Human Guinea Pigs.”

• Justin Timberlake hosts and performs on a repeat “Saturday Night Live” (10:30 p.m., NBC), featuring appearances by other repeat hosts, including Tom Hanks, Steve Martin, Alec Baldwin and Paul Simon.

Cult choice

A serious writer (John Turturro) enters Hollywood purgatory in the Coen brothers’ 1991 comedy “Barton Fink” (7 p.m. Saturday, Sundance), co-starring John Goodman.