The end of Season 3 left our Killjoys scattered to the far corners of The J galaxy and beyond. Dutch is on a journey to face her biggest foe yet, while D'av and John are trapped in an elevator in deep space with a pregnant Delle Seyah. They are united by the knowledge of the name of their true enemy: The Lady, an immeasurable manifestation of evil without beginning or end. The Lady is making her play, and our trio has something she wants.

In Season 3 war looms over the J Star System. After sustaining serious personal loss, Dutch, Johnny, and D'avin prepare themselves for what lies ahead. While the trio struggles to assemble an army, a dangerous force – Aneela – heads towards them. The unhinged daughter of Dutch's late mentor Khlyen, Aneela is hell-bent on revenge for the death of her father. The team's toughest challenge yet, and perhaps Dutch's only hope of stopping Aneela, includes convincing a motley gang of bounty hunters to go from believing "The Warrant is All" to "The War is All."