To stop more Omec from invading Earth, Nolan must lead a small team on a suicide mission to destroy Kindzi's cruiser.
Nolan and the other learn about the pending Omec invasion and search for Kindzi. Meanwhile, Datak convinces Yewll to give him a fighting chance against his Omec captors, and Stahma tries to make amends with her son.
Berlin returns to Defiance and helps Irisa find Nolan, who was abducted from the VC convoy. Meanwhile, Kindzi drains T'evgin of his blood to keep him captive, and Datak asks Yewll for help defeating the Omec.
The VC send a representative to Defiance to negotiate a peace with T'evgin. However, complications from Nolan's recent operation complicate matters. Meanwhile, Datak returns from the dead only to discover that T'evgin is in love with Stahma.
An unknown creature tears apart an Indogene, and Yewll appears to be the victim... until she turns up alive and well. Meanwhile, Nolan comes to terms with the death of the militia under his command, and Stahma tries to apologize to Amanda.
Nolan and the militia receive help from an unexpected ally, but learn that he's not all that he appears. Meanwhile, Amanda gives Datak the chance to restore his honor and redeem himself when Yewll comes up with a way to defeat the VC army.
An arms dealer brings Defiance deliverance, but asks for a drink with Berlin as his only price. Meanwhile, Datak is sentenced to death and prepares for his execution, and asks a sacred favor of his son.
Datak and Stahma go on the run when Alak exposes them to keep his son. Meanwhile, the Omec refuse to help Defiance, and Rahm receives a visit from home.
Yewll works desperately to save Nolan and Irisa, and is forced to turn to the Omec for help. Meanwhile, Alak escapes from Rahm, and Stahma takes steps to thwart her husband's plan to assassinate T'evgin.
After someone blows up the Arch, Nolan and Amanda travel to an E-Rep weapons cache to replace the weapons destroyed by the Shrill. However, they end up meeting an old friend. Meanwhile, Stahma receives new orders from Rahm: assassinate T'evgin.
The Tarrs return to Defiance with a cover story, and Datak is forced to promise he will remain loyal to Amanda. Meanwhile, Nolan and Irisa follow up on Datak's report on the approaching VC army, and Stahma makes T'evgin's acquaintance.
Amanda negotiates with T'evgin to gain gulanite for Defiance in return for his injured daughter. Meanwhile, Alak and Pilar say their goodbyes to Rafe and Christie, and Rham gains leverage of Datak and Stahma.
While Rafe and the Tarrs race to recover their children, Nolan and Irisa finally escape from the underground cavern beneath Defiance... only to discover that a new menace threatens their home.