History
Little is detailed about Kl'rt's life before the zombie plague arrived on Earth-2149, however it can be presumed that it followed much the same path as Super-Skrull of Earth-616.
At some point becoming infected upon Earth, Super-Skrull is part of the zombie super-villain team that tries, unfruitfully, to take down Galactus. He presumably was killed in the battle with the Power Cosmic Zombies.[1]
Following his death, his people attempted to duplicate the experiments that led to him being granted the powers of the Fantastic Four, but unable to duplicate the process exactly, they settled for the creation of a team of four Skrulls who each possessed the power of one of the FF.[2]