Professor Power had double agents in the New York S.H.I.E.L.D. headquarters free Leviathan, Mad Dog, and Mutant Force from S.H.I.E.L.D. custody, and sent Leviathan against the Defenders.
Professor Power had spies within the New York S.H.I.E.L.D. headquarters, freeing Leviathan, Mad Dog, and Mutant Force from S.H.I.E.L.D. custody, and sending Leviathan against the Defenders.