Plot: Donald arrives in time to join Xandra and the Caballeros and the four of them charge the basement of the mansion, while Felldrake gives Sheldgoose powers of his own to stall them while he reaches his full power. Sheldgoose's attempts to summon evil allies from their past adventures are countered by the Caballeros's own allies, and they arrive in time for Felldrake to awaken and destroy the Institute