Collects Avengers Annual #20, Incredible Hulk Annual #17, Namor the Sub-Mariner Annual #1, Iron Man Annual #12, West Coast Avengers Annual #6. The underground has gone to war! Lava Men, Moloids and more battle the Deviants and the Avengers are caught in the crosshairs! Can Earth's Mightiest prevent the warzone from spilling over to above ground?