A deadly disease is spreading around the world, and the travelers must get to the bottom of where it came from and how to stop it before it’s too late.

Oliver and Lyla team up on a secret mission for Diggle. Felicity finds out and disapproves of the plan and opts to stay behind. When Tobias Church launches a deadly…

When Tobias Church captures and tortures one of Oliver’s new recruits, Oliver must turn to an old friend, Christopher Chance AKA the Human Target, for help. Meanwhile, Felicity’s worlds collide…

Sam enlists Rowena’s help to track down an old world, powerful family of witches after Dean gets hit by a spell that is rapidly erasing his memory.