The Avengers and Fantastic Four return from the pocket dimension of "Heroes Reborn," but the Earth they left behind still needs heroes! As waters rise and Celestials loom, will Rikki "Bucky" Barnes and her Young Allies step up - or is Doctor Doom the iron hand this ravaged planet needs? Trapped on this Counter-Earth, the disguised villains called the Thunderbolts must choose between escape or becoming heroes! And the interdimensional Exiles drop in for a visit! But when Onslaught rises, Franklin Richards returns to the original world he created - and Rikki Barnes must summon allies from the real Marvel Universe! Collecting HEROES REBORN: THE RETURN #1-4; THOR ANNUAL 1999; HEROES REBORN: DOOMSDAY, ASHEMA, MASTERS OF EVIL, REBEL, REMNANTS, YOUNG ALLIES and DOOM; FANTASTIC FOUR (1998) #25 and #31; DOOM #1-3; DOOM: THE EMPEROR RETURNS #1-3; THUNDERBOLTS (1997) #51-52, #60-62, #64, #66, #68, #70, #72 and #74; EXILES (2001) #81-82; ONSLAUGHT REBORN #1-5; ONSLAUGHT UNLEASHED #1-4; and MARVEL SPOTLIGHT: HEROES REBORN/ONSLAUGHT REBORN.