Reeling from the events of their standoff with Moloch, Ichabod and Abbie encounter an angel, Orion, that they believe can help them. Meanwhile, Katrina searches for the humanity in Abraham.

When Pandora uses her powers to unleash a new form of evil, Abbie and Crane are forced to face their pasts in unexpected ways.

With Booth and Brennan in tow, Abbie and Crane set out to prove that supernatural forces are at play when a mysterious death plagues the FBI. As Pandora unleashes a force to awaken the dangerous Red Coast General Howe, both teams must find a way to save the town from the British Army of the Undead. Can the power of Booth and Brennan combined with Abbie and Crane be enough to stop Pandora’s evil forces?

The crossover starts on Bones S11E05 The Resurrection in the Remains (I).

In the aftermath of Jenny and Joe's run-in with Sophie, Abbie is in deep water with Reynolds. Meanwhile, the Witnesses deal with lasting implications of the shard and find themselves in grave danger as they come face-to-face with a greater evil than they could have imagined.

After a supernatural event takes the Witnesses by surprise, both Crane and Abbie are forced to work alongside their most hated foes yet. Meanwhile, Jenny and Joe struggle to salvage their relationship, as they continue to battle their own internal demons.

After a startling discovery, Abbie and Crane realize what they must do in order to make Pandora’s box complete again. Meanwhile, the team works tirelessly to stop The Hidden One, before he destroys all of humanity. Can the Witnesses succeed with the fate of the world in their hands once again.

Crane and Jenny begin to navigate life following the unexpected death of Abbie Mills. When he finds himself in a the nation’s capital, Crane must forge unlikely partnerships in his quest to find the next Witness, as he discovers that there is more evil at play than he realized was possible.

Just before Molly's 11th birthday, her father returns from duty. As Diana begins to wonder if her ex might be ready to be a part of his daughter's life full-time, the team has a shocking realization.

When a mysterious woman finds her way into the vault, the team struggles to understand who she is and with whom her allegiances lie. Meanwhile, Alex must come to terms with her complicated feelings when she finds herself in a tight spot. Can Team Witness handle what might be revealed?

Dreyfuss finally garners enough power to infiltrate the White House, and his group of minions grow strong enough to take action. Can Team Witness stop Dreyfuss in time?