The border between horror and farce is porous. No one knows this better than Robert Englund, better known as Freddy Krueger of the “Nightmare on Elm Street” films. He stars in the thoroughly predictable and ridiculous sequel “Lake Placid: The Final Chapter” (8 p.m. Saturday, Syfy).

If movies about bodies of water filled with mutant crocodiles that chomp up nubile teenage bodies are your cup of tea, don’t miss this. The movie’s most absurd and redeeming feature is Yancy Butler’s spirited job of overacting. She’s Reba, a hyper-angry croc-killer with a penchant for angry one-liners.

• Brian Unger hosts the second season of “How the States Got Their Shapes” (9 p.m. Saturday, H2), an offbeat and anecdotal approach to state histories. H2 is the History Channel spinoff network that still broadcasts the light historical series displaced by more ratings-driven fare like “Pawn Stars.”

Tonight’s other highlights

• Original helpings of “Teenage Mutant Ninja Turtles” (10 a.m., Nickelodeon) return. Can a New Kids on the Block revival be far behind?

• Showtime presents a 12-hour marathon of the first season of “Homeland” (11 a.m., Showtime), the Emmy-winning drama beginning its second season on Sunday.

• Nebraska hosts Wisconsin in college football (7 p.m., ABC).

• Oklahoma State hosts Texas in college football (6:30 p.m., Fox).

• A rancher turned sheriff (Dennis Quaid) and a newly arrived gangster (Michael Chiklis) square off on the repeat season premiere of “Vegas” (7 p.m., CBS).

• A teen temptress turns vindictive and violent when her latest conquest calls it quits in the 2012 shocker “A Mother’s Nightmare” (7 p.m., Lifetime). Annabeth Gish stars.

• Sir Arthur Conan Doyle’s most famous characters get a 21st-century adaptation on the new series “Elementary” (8 p.m., CBS), starring Jonny Lee Miller and Lucy Liu.

• “Demitri Martin. Standup Comedian” (9 p.m., Comedy Central) offers observational humor delivered in a

• Mick Jagger hosts and performs in a repeat of last season’s finale of “Saturday Night Live” (10:30 p.m., NBC).