When a S.H.I.E.L.D. installation researching space travel is attacked by aliens known as the Kree, a scientist named Philip Lawson is exposed as a Kree spy named Mahr Vehl when he saves the installation by fighting off the Kree forces. Now captured by S.H.I.E.L.D., Mahr Vehl reveals the plans for the Kree to contain humans to Earth until the coming of Gah Lak Tus insures their extinction. Defecting to the Earth defense force, Mahr Vehl unites behind the Ultimates and the Fantastic Four to challenge the Kree warship.
This series continues the Ultimate Galactus trilogy begun in Ultimate Nightmare and concluding in Ultimate Extinction.
Ultimate Galactus - Vol. 2: Secret
Ultimate Secret #1-4