In “Crossbones,” Blackbeard, played by John Malkovich, plans to kill Jamaican civilians, and it’s up to Lowe to stop him. (Francisco Roman/NBC)

For your Friday night cry, “A Leap of Faith: A Meredith Vieira Special” (NBC at 8 p.m.) introduces us to Paolo Macchiarini, a doctor trying to revolutionize the way diseases are treated with regenerative medicine. Viewers also meet the people Macchiarini is helping as they share their life experiences with the NBC News co-host.

Based on the young-adult novel “Boys Are Dogs,” “Zapped” (Disney at 8) is about a teenage girl who discovers that a dog-training app on her phone can control the boys around her. As expected, mayhem ensues.

The stories behind a bizarrely large acorn sculpture and a skyscraper in the form of a sandal are examined on “Monumental Mysteries” (Travel at 9), along with an eccentric engineering emperor.

“Great Performances at the Met” (MPT and WETA at 9) presents Puccini’s “La Bohème” with Vittorio Grigolo playing the role of poet Rodolfo, who begins a doomed love affair with a seamstress named Mimi (played by Kristine Opolais) in 1830s Paris.

SERIES PREMIERE: Cory and Topanga are back for “Girl Meets World” (Disney at 9:45 p.m.), a continuation of the tween favorite sitcom from the 1990s that now has the famous couple (played by original cast members Ben Savage and Danielle Fishel) as parents to Riley and Auggie.

On this special edition of “20/20” (ABC at 10), Barbara Walters interviews Peter Rodger, the father of Elliot Rodger, who — in an attack last month near the campus of University of California at Santa Barbara — killed six people, injured 13 and took his own life.

Microbiologist Martin Blaser, author Max Brooks, radio personality Andy Dean and journalists Bobby Ghosh and Joy Reid make up the “Real Time With Bill Maher” (HBO at 10) roundtable.

Once Lowe learns of Blackbeard’s plan to kill innocent Jamaican civilians on the island on “Crossbones” (NBC at 10), it’s up to him and anyone he can find who’s not already in on the scheme to stop the merciless commodore.

Actor Kevin Spacey comes to “The Tonight Show Starring Jimmy Fallon” (NBC at 11:35), along with stand-up comedian Lewis Black.

Animal trainer Jack Hanna stops by the “Late Show With David Letterman” (CBS at 11:35), with Stephen Malkmus and the Jicks playing musical guests.

Ludacris, Kesha, Josh Groban and Brad Paisley of “Rising Star” are on “Jimmy Kimmel Live” (ABC at 11:35), along with YouTube sensation Michael Stevens.

Rachel Lubitz