Ari leads Varus and three Roman legions into the Teutoburg Forest — and into history. Thusnelda makes a bloody sacrifice to preserve the alliance.

The tribes prepare to attack the Roman camp before ships with reinforcements arrive. Segestes approaches Tiberius with a treacherous proposal.

Ari and Thusnelda forge a political marriage and begin uniting the fractious Germanic tribes. Folkwin is believed dead but has actually been enslaved.

Ari embraces his new role with the Cherusci but his shift of allegiances runs deeper than Varus knows. Thusnelda and Folkwin rally a rival tribe.

A friend comes to Thusnelda’s aid when she infiltrates the Roman camp. Without Ari knowing, Marbod meets with Tiberius in a bid to secure peace.

Ari suspects the Romans of rebuilding their forces, so he seeks the help of an eastern tribal chief, Marbod. Ari’s brother, Flavus, arrives in Germania.

Germanicus accuses Flavus of being a traitor. Ari brings Gaius to the village and then seeks revenge against Marbod. Thusnelda is angry at Ari for lying.

Tiberius requires a test of Marbod's loyalty. Flavus proposes an offer to Germanicus. The tribal chiefs gather to name Marbod king but tragedy strikes.