Invasion! The Avengers are hot on the trail of the Fixer... and the twisting trail leads to a warehouse complex in suburban Ohio. Prince Namor spearheads the attack on the Fixer's headquarters, and shortly thereafter all five Avengers are dealing with a dozen or so deadly devices. Under the direction of Captain Marvel, Earth's Mightiest Heroes survive the Fixer's traps and rescue Mentallo. Usually the Fixer and Mentallo work together, but not this time. Why not? The mystery only deepens after the Avengers return to Hydrobase, interview Mentallo, stow the awesome android, and discover the comatose Fixer! Who or what is pulling the strings behind the scenes?