The Ottoman army launches an ambush; Leo must put his faith in his friends and in himself to have a chance to defeat the Turks.

Leo and Sophia struggle to control the mysterious device they've built. Back in Florence, Riario awaits judgment while Lorenzo and Vanessa take their partnership to the next level.

Nico and Zo turn to an old enemy to gain support for the Crusade; Leo is ambushed by the Labyrinth.

A former nemesis returns to Florence and stands in opposition to Crusade efforts; Vanessa and Nico ponder their futures; Leo attempts to decipher the Turkish armor.

The Monster of Italy is finally captured, but the upcoming Crusade Festival is still threatened by danger.

Leo's paranoia isolates him from his friends; Lucrezia searches for a way to make amends for past sins.

Carlo attempts to program Leo to become one with the Labyrinth; Leo's escape into an alternate reality threatens both his mind and his life.

Leo's investigation of a grisly murder poses a threat to the Labyrinth.

Leo devises an escape from Otranto but may not be able to save those closest to him.

Leonardo and his allies are forced to retreat when the Ottoman Empire storms the city of Otranto.

An unlikely alliance is needed to save Italy from an Ottoman attack; Riario faces danger; Nico takes control of Vanessa's destiny.

Leonardo returns to learn that Duke Federico has been ruling Florence with an iron fist; a sinful Riario seeks redemption; King Ferrante negotiates with Lorenzo.

Leonardo and Riario face death; Zoroaster and Nico plan an escape; Lorenzo waits to meet with the king of Naples; Bayezid seeks diplomacy in Rome.

Leonardo and his allies face deadly threats as they search for the Book of Leaves; Carlo helps Clarice; the Sultan's son is intrigued by Lucrezia.

Entering the Vault of Heaven presents challenges for Leonardo and Riario; Lorenzo becomes a part of King Ferrante's bloody games; Lucrezia meets the Turk in Constantinople.

Riario and Nico are reunited with Leonardo in the New World; Lorenzo tries to save Florence with the help of a former flame; Clarice works to retain control of the Medici bank.

Leonardo attempts to navigate the Atlantic without maps; Lucrezia is smuggled into the Vatican for an important meeting; Lorenzo's identity is discovered during his trip to Naples.

Leonardo continues his search for the Book of Leaves; Lorenzo is forced to make sacrifices when Pope Sixtus takes aggressive measures against Florence; Lucrezia looks for new alliances in Rome.

Leonardo uses his intellect to save Florence as Pope Sixtus brings powers together; Nico tries to resist Riario's temptations.

The Pazzis make their move; Leonardo gambles for the future of Florence; Riario makes progress in his quest for the Book of Leaves.

The Pazzis plot to kill Lorenzo and Giuliano on Easter Sunday; the Turk reveals the location of the Book of Leaves; Lucrezia makes a confession; Leonardo tries to save the Medicis.

The Borgias, led by patriarch Rodrigo, are a family of outsiders from Spain who try to take over control of Renaissance-era Italy. Through the use of bribery, extortion and torture, Rodrigo rises up the ranks to become pope. Two of Rodrigo's children are used as pawns by being married off to members of rival families at a young age. Vanozza, Rodrigo's long-time mistress and mother of his children, and Giulia Farnese battle for the elder Borgia's affections. The story of the Borgias has inspired such works as Machiavelli's political treatise "The Prince" and Mario Puzo's "The Godfather."

William Masters and Virginia Johnson are known as pioneers of the science of human sexuality. Their research shoots them to fame on a trajectory that takes them from humble beginnings in the Midwest to the cover of Time magazine. Masters is a brilliant scientist who is out of touch with his own feelings. Johnson is a divorced mother who is ahead of her time on many fronts, including her determination to have a meaningful career. The pair's relationship isn't just professional, as it evolves into a three-way "marriage" with Masters' wife, Libby. "Masters of Sex" is based on Thomas Maier's book of the same name, which profiled the pair.

A prequel to the classic Robert Louis Stevenson novel "Treasure Island," "Black Sails" is a pirate adventure that centers on the tales of Captain Flint, who has a reputation throughout the West Indies as being the most brilliant, most feared of all the Golden Age pirates. It's 1715, and as Flint fights for the survival of New Providence Island -- a debauched paradise teeming with pirates, prostitutes, thieves and fortune seekers -- in the wake of threats from British and Spanish forces, he aligns himself with Eleanor Guthrie, daughter of the local kingpin, to hunt the ultimate prize and ensure his people's survival. But standing in the way are rival captains, Eleanor's intrusive father, and perhaps the bigger obstacle of all: John Silver, a young, fast-talking, authority-flouting sailor recently added to Flint's crew.

A man from the post-apocalyptic future, Cole uses a dangerous, untested method of time travel to get from 2043 to the present day. He is on a mission to locate and rid the world of the source of the plague that will eventually annihilate the human race. Assisting him is Dr. Cassandra Railly, a virologist who must decide whether to do harm in order to save the world -- regardless of the fact that she has taken the Hippocratic oath. The sci-fi series is based on Terry Gilliam's 1995 film, which starred Bruce Willis as Cole.