To celebrate Ms. O's 100th anniversary, the agents go back in time to witness her last case as an agent. However, something goes wrong and they change the future for the worse.

Darken is set in a bizarre, mysterious, and violent unknown world with danger and death around every corner. After a young woman is accosted by a dying warrior in the middle of the street, a bizarre incantation propels her into the realm of Darken - a violent prison-like world of labyrinthine rooms, interconnected with no apparent rhyme or reason and no way of escape. As she fights for survival within this brutal place, she finds allies who are rebelling against the rule of a self-appointed religious despot who demands allegiance to an all-powerful god called "Mother Darken." Eve and her allies must fight with everything they have if they are to have any hope of surviving the horrors Darken has in store for them.

The Odd Squad springs into action when a rival group called Weird Team starts to cover up problems instead of solving them.