Skrull

The Skrulls are an alien species. They are known for their long-time war with the Kree. Their government is the Skrull Confederacy. They are constantly trying to invade Earth and deal with the problems arising from Galactus and Silver Surfer. They genetically altered the Super-Skrull to have the same powers as the Fantastic Four.

Background
Had SS undefined gone onto a second season, the Silver Surfer would have tried to end the war between the Skrulls and Kree.