HISTORY: (Fantastic Four I#2-BTS)-After the Fantastic Four's first encounter with and defeat of the Skrulls, Reed Richards hypnotized the four invaders to turn themselves into cows, and to believe that they really were cows. He left them in a field in King's Crossing, Vermont.

(Avengers I#89-97-BTS)-During the Kree/Skrull War, the Skrulls regained their memories and impersonated some of original Avengers, in an effort to force them to disband. Another of the Skrulls took the form of H. Warren Craddock, who was running for office. The Craddock-skrull was slain after being exposed.

(SKK#2(fb)-BTS)-The remaining three former cow-Skrulls were handed over to the Alien Activities Commission, who forced them to become cows again. This time, however, they sent the Skrulls to the slaughterhouse, along with the rest of the beef. The Skrulls were slaughtered and mixed with other, real beef, meat and distributed across the country. In the form of hamburgers, the Skrull meat was consumed by an unknown number of Americans. Some of the people who ate the beef proved immune to the Skrull DNA. Some died horrible deaths. A small number, were "infected" and developed metamorphic powers, along with progressive and terminal neurologic disease.

The Skrull Kill Krew's viral affliction, Skrullovoria Induced Skrullophobia (SIS), perhaps better known as Mad Skrull-Cow Disease (MSCD), differs from the natives of King's Crossing (where the Skrulls lived briefly as cows), who drank the milk from Skrulls, and suffered from Pseudo-Milk Induced Skrullophilia (PMIS). Sufferers of PMIS (not to be confused with PMS, although the two are not mutually exclusive), also gained shape-changing powers, but rather than wanting to kill the Skrulls, they took on Skrull personality traits, such as xenophobia and military-type organization. This was documented in Fantastic Four I Annual#17.