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.
Trapped in the mysterious and mind-bending greenspace and on the run from the deadly Lady, Aneela and her father Khlyen struggle to stay one step ahead while keeping a wounded Dutch alive.
With criminals chasing an injured Johnny, D'av and Delle Seyah take drastic measures to save him.
Johnny manipulates D'av into helping him find a green pool. Zeph faces possible death.
Dutch awakens to John at the brink of madness and the birth of D'av's child.
With D'av's newborn son's life on the line, the trio take desperate measures to save him.
Team Awesome Force faces off with a relentless, deadly assassin whose arrival is triggered by their examination of the memory Khlyen altered in Dutch's mind. While Pree searches for his missing husband on Westerley, Zeph struggles to save Pip from an unexpected medical complication.
With D'avin having left, Dutch and John are left to follow the hidden pulsar in Khlyen's mysterious story that leads them to discover an unexpected past – including the origins of the assassin.
An awkward Jaqobis homecoming takes a deadly turn as Dutch and Zeph risk everything for science.
Team Awesome Force sneaks onto the RAC to rescue Westerly's stolen children; Zeph and Pip grow closer.