What to Watch on Tuesday: PBS claims to have Bob Dylan's electric guitar

Pretty Little Liars (8pm, ABC Family) - Hanna attempts to find out who's assiting Garret, and Emily has another flashback, which points her to a suspect.

History Detectives (9pm, UNC-TV) - The Season 10 premiere investigates the history of a Fender Stratocaster electric guitar to determine if it's the same one Bob Dylan played at the 1965 Newport Folk Festival (where he was booed off the stage for "going electric"). (Note: PBS is currently in dispute with Bob Dylan over this. A lawyer for Dylan says the singer still has the guitar, but PBS is so far standing by its claim that Dawn Peterson has the instrument). Also, possible Beatles autographs from 1964 Miami Beach, and a $5 thrift-store find that may have a Frank Zappa link.

MasterChef (9pm, Fox) - Paula Deen is the guest judge for a Southern-inspired mystery-box challenge.

American Gypsies (9pm, National Geographic Channel) - The series premiere introduces the Johns, a tight-knit Romani family  living in New York City. Patriarch Bob Sr.'s health is failing, prompting brothers Nicky and Bobby to battle for leadership. Meanwhile, a rival family encroaches on Nicky's psychic shop, leading to a violent confrontation.

NY Med (10pm, ABC) - A man with a liver disease needs a transplant and hopes to live long enough for his daughter's wedding, and a trauma surgeon finds his groove in New York after leaving New Orleans in the aftermath of Hurricane Katrina.

Real Sports with Bryant Gumbel (10pm, HBO) - Segments include a look at marching-band hazing; an interview with MLB All-Star Matt Kemp; and a report on former Olympic gold medalist Dominque Moceanu.