Veronica suspects there is another traitor at the fort.

Joseph is growing weary of the sky people. Is he a traitor too?

Veronica and Izzy discuss how to mage relationships in 10,000 BC.

Levi risks it all to save those he loves and prove himself.

Sam defends his friends against the enemy.

Gavin discovers who betrayed him and the consequences.

A showdown turns ugly as the men learn who the traitor is.