The great heroes of the Marvel Universe are vanishing without a trace! What has happened to Spider-Man, the Thing, the Scarlet Witch, Captain America, and the rest of the MU's heavy hitters? Spider-Girl, the Fantastic Five, and A-Next must join forces with today's superstars to uncover the answer - and the trail leads to a major Avengers villain! Does the presence of the Watcher signify the end of this age of heroes? Reprints Last Hero Standing #1-5.