The Secret Saturdays come to Bellwood to investigate a rash of chupacabra attacks. Ben and Rook assist, finding the chupacabras have been draining aliens of their lifeforce. They soon discover that the chupacabras are being controlled by Dr. Animo, who is an old business assciote of V.V. Argost. Using the alien lifeforce, Animo successfully revives Argost in a mis-matched hybrid body. Now Ben, Rook, and the Saturdays must work together to turn the tables on the alliance of Dr. Animo and V.V. Argost when they plan to make an army of "Franken-Cryptids.