r -- from triumphs and tragedies of ages past to a bold new heroic era! Asgard is the target of a dark, destructive force from another reality. When Thor and Sif dive deep into the heart of the fractured World Tree, what they find attracts the attention of the Silver Surfer -- and in his wake follows Galactus! But the most horrifying threat of all is the Serpent -- who will make the son of Odin, and the whole Marvel Universe, know fear! Thor is fated to die -- but can a team-up with young Loki stave off disaster, or will everything burn? Collecting THOR: AGES OF THUNDER, REIGN OF BLOOD and MAN OF WAR; SECRET INVASION: THOR #1-3; THOR GOD-SIZE SPECIAL; FREE COMIC BOOK DAY 2010 (IRON MAN/THOR); THOR (2007) #615-621 and #620.1; MIGHTY THOR (2011) #1-22, #12.1 and ANNUAL #1; FEAR ITSELF #1-7; FEAR ITSELF #7.2: THOR and JOURNEY INTO MYSTERY (2011) #642-644.