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.

Leo must put his faith in his friends and in himself to have a chance to defeat the Turks.

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

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

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 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 makes an unexpected discovery in the New World. Lorenzo attempts to save Florence with the help of an old flame. Clarice struggles to retain control of the Medici Bank.

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.

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.

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

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

Rising artisan Leonardo da Vinci is commissioned by the powerful Medici to create an Easter spectacle in Florence. After some maneuvering, da Vinci is hired to engineer war machines. A…

Leonardo continues his quest for the Book of Leaves. The Pope’s nephew arrives and meets his spy. Leonardo’s war designs fail, causing a rift with the Medicis. The Pope learns…

Riario engages the Pope and a mysterious prisoner in a discussion concerning the count’s defeat, while Leonardo searches for a rational explanation when an outbreak of demonic possession occurs at…

Bechhi is accused of being a spy for Rome. The armies of Rome and Florence face off, and Leonardo reveals his latest weapon.

Lorenzo orders Piero da Vinci to defend his estranged son in court. During a performance for visiting royalty, Leonardo surprises the corrupt judge. Back at his workshop, Leonardo is surprised…

A clue from the Turk about the Book of Leaves sends Leonardo to Wallachia, where he encounters Vlad Dracula. Lorenzo and Piero meet the Duke of Urbino. The search for…

Leonardo builds an underwater suit and uses the sewers to enter the Vatican, where he meets the Pope and the mysterious prisoner. Giuliano reveals the true identity of Rome’s spy.

The Pazzis prepare a murderous plot for Easter Sunday. The Turk tells Leonardo where to find the Book of Leaves. Lucrezia makes a confession as Leonardo attempts to save the…

Nolan and Berlin pursue the Tarrs after their connection to the Votanis Collective is exposed; at the same time, Alak comes to grips with his future as a father.

A visiting arms dealer divides Amanda, Nolan, and Berlin. Nolan recruits a militia, but the people need convincing. Datak and Alak have a reckoning. Stahma’s presence causes strife.

Defiance is under siege. As Nolan, Amanda, Irisa and the militia defend the town against the Votanis Collective, Datak recalls his father’s chilling lessons and makes a pivotal decision, while…

A gruesome murder is committed by an unusual beast that’s on the loose and being hunted down by Nolan and Irisa, while Doc Yewll delves into the surprising victim. Elsewhere,…

Amanda decides to ignore Nolan’s skepticism and welcome an encouraging Votanis Collective delegation to Defiance. Meanwhile, Stahma’s loyalties are tested by an unexpected arrival; and T’evgin takes another step towards…

Nolan is freed from custody; Amanda, Irisa and Berlin try to release Nolan from Kindzi’s clutches; Datak regrets seeking help.

Nolan, Amanda and Irisa search for a way to stop Kindzi from transporting more Omec to Earth; Datak tries to escape from an Omec compound; Stahma asks for forgiveness.

Omec hunts Defiance citizens; Nolan, Amanda, and the others undertake a potential suicide mission to end the threat once and for all.

Nolan and Irisa are mysteriously rescued from their underground confinement just in time to discover that enemy forces are marching on the town of Defiance, which has fallen on hard…

T’evgin comes to Defiance seeking his daughter, who Nolan and Amanda offer to release in exchange for some gulanite; at the same time, Alak and Pilar head off alone to…

Amanda negotiates with the Omec, a new alien race, for the future of Defiance; and the Tarrs return to find much changed and their loyalties tested between the humans, the…

Nolan and Amanda are captured while excavating a buried weapons cache; Berlin investigates a Votanis Collective bombing in the heart of Defiance and sees an opportunity to get revenge on…

Amanda and Doc Yewll must enlist the Omec for help rescuing Nolan and Irisa, who have fallen into an unexpected and potentially fatal tour of their own past. Meanwhile, Datak…

Nolan’s desperate search for Irisa yields vital information which takes him south; back in Defiance, the Earth Republic has installed Mayor Pottinger, a charming, calculating and ambitious man who takes…

Irisa returns to Defiance and is arrested; Mayor Pottinger offers Nolan her release in exchange for capturing those responsible for nearly killing him; Stahma plots to keep Datak behind bars.

Irisa’s terrifying black-outs escalate, driving a wedge of secrecy between her and a worried Nolan. Meanwhile, the Tarr family business thrives under Stahma’s self-appointed direction while an increasingly suspicious Datak…

After his caravan is viscously attacked in the badlands, a badly shaken Pottinger orders Nolan to hunt down and destroy those responsible. Nolan’s manhunt implicates one of Rafe’s miners causing…

Amanda is terrorised by a stalker but the true reasons behind her frightening experiences have far reaching ramifications not only for her but for Pottinger and Doc Yewll as well.

After an Arkfall crash, Pottinger recruits Nolan to lead their salvage mission but his secret agenda puts them in grave danger against an Alien race they’ve never encountered before.

Datak is framed for a bizarre murder and turns to an unlikely ally for help; Irisa discovers more about her destiny after encountering a mysterious stranger.