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What to Watch on Saturday: ‘Mythbusters’ takes on ‘Star Wars’

Laser blasters are put to the test on “Myth Busters.”
Laser blasters are put to the test on “Myth Busters.” DISCOVERY

Mythbusters (9 p.m., Discovery) – For the second time, Jamie and Adam take on the science of the “Star Wars” universe. Among the topics they cover are light saber duels and laser blasters.

Also on tonight . . .

River Raft Nightmare (8 p.m., Lifetime) – In this movie, armed thieves take a woman and her teenage daughter on a whitewater rafting trip to find their missing money.

Doctor Who (8 p.m., BBC America) – The “Doctor’s Finest” submission this week is “The Day of the Doctor,” in which the Doctors share an adventure across space and time, and an ancient battle reaches a devastating conclusion.

Blunt Talk (10 p.m., Starz) – Walter (Patrick Stewart) is ordered by the court to attend AA meetings while his staff goes about their peculiar weekends.

Instant Jam (10 p.m., CMT) – Darius Rucker surprises fans with a beachfront concert at the Windjammer in his hometown of Charleston, S.C.