The death of Squirrel Girl! Can this be true? Has the Unbeatable really been beaten? And by the Grim Reaper, at that? Is this truly the end of Doreen Green? Plus: Witness a fighting-mad Iron Man! Thrill to underwater adventure! And recoil as the world of our fallen hero is rocked by a pesky invasion of Skrulls! Why is all this happening? Who is behind it? And what goals--sinister or otherwise--are they working toward? Prepare for all to become clear as mysteries are laid bare and select origins are revealed! All this plus a guest appearance from Spider-Man!