The Secret Invasion has been underway for years. For how long and to what extent, Tony Stark is not sure, but there is one thing he does know: Now is not the time for complacency. Following hot on the heels of the stunning revelation that Skrulls have been masquerading as Elektra and Black Bolt, Stark puts his best data-mining technology to the test to piece together their treacherous plot. From their first encounter with the Fantastic Four, through the epic clash of the Kree/Skrull War and the destruction of the Skrull Throne world, all the way to the recent Annihilation War and subsequent invasion of Earth, the timeline of known Skrull activity is made clear so effective battle plans can be drawn. With the Classified Top Secret Secret Invasion Saga report, the new Director of S.H.I.E.L.D. must leave no stone unturned in his analysis of this insidious enemy's history: The fate of the Earth will depend on it!