Who – or what – is the Cosmic Jailer? What being is powerful enough to chain Eternity itself? That is the mystery Galactus must solve – before it's too late. Ultimate problems require ultimate solutions, and Galactus will call on those who helped cure his insatiable hunger. Captain Marvel, Black Panther, Blue Marvel, Spectrum and Ms. America! Together they are the Ultimates, protectors of the Omniverse. But now they are something more – the newest heralds of Galactus, the Lifebringer!