Earth's Mightiest Heroes and Marvel's First Family share some of their greatest adventures! First, it's the battle of the century -- the Hulk vs. the Thing! And it'll take the combined forces of both teams to stop the destruction! Worlds collide again when Ultron-7 crashes Quicksilver and Crystal's wedding! And the Avengers and the Fantastic Four each have roles to play in cosmic encounters with Annihilus and the Skrulls! Then, on a break from the FF, Mr. Fantastic and the Invisible Woman actually join the Avengers for the Super-Nova saga! The New Avengers and the Fantastic Four face the Kree - -but why are Hank Pym and the Mighty Avengers breaking into the Baxter Building?!COLLECTING: FANTASTIC FOUR (1961)#25-26, 150, and 255-256, FANTASTIC FOUR ANNUAL #19; AVENGERS (1963) #127, 233, and 301-303, AVENGERS ANNUAL #14; NEW AVENGERS: AAFES #1; MIGHTY AVENGERS (2007) #25-26Written by: Stan Lee & Jack Kirby, Gerry Conway, John Byrne, Steve Englehart, Roger Stern, Ralph Macchio, Brian Michael Bendis, and Dan SlottPenciled by: Jack Kirby, Rich Buckler, John Byrne, Sal Buscema, Bob Hall, Dan Jurgens, and Stephen Segovia