Gyro, Fenton and Huey take a malfunctioning B.O.Y.D. back to the lab where he was created in Japan, but as Huey bonds with the robot boy, a secret from Gyro’s past threatens to destroy the city and Gizmoduck.

The future of adventuring hangs in the balance as the Duck family uncovers earth-shattering secrets in a final standoff with F.O.W.L.