Marvel, New York, 2006, 1^st pr thus.  ISBN 0-7851-2045-9.  Large soft cover, 311 pages.  Unread copy with very light edge and cover wear; faint crease at lower rear corner.  Collecting Iron Man #279, Thor #446, Captain America #400-401, Avengers West Coast #82, Quasar #34-36, Wonder Man #9, Avengers #347 and What-If #55-56.  ‘One galaxy’s heroes are another’s villains, and two galaxies’ worth of them collide head-on – with the Avengers in the middle of a war whose repercussions will haunt them for years!  The events that split and shook Earth’s Mightiest Heroes to their foundations end here, and intergalactic boundaries aren’t the only lines being drawn!  Plus:  The tri-galaxy war devastates Earth far more literally when we see “What If the Avengers Lost Operation:  Galactic Storm?”!’ (from rear wrap)