Skrull

The Skrulls are a fictional race of extraterrestrial shapeshifters appearing in American comic books published by Marvel Comics. The Skrulls first appeared in Fantastic Four #2 and were created by Stan Lee and Jack Kirby. They originated from the planet Skrullos and their empire is located in the Andromeda Galaxy.

Fictional species biography
Millions of years ago, in the main Marvel continuity, the Celestials perform genetic experiments on the reptilian ancestors of the Skrulls, resulting in three branches of Skrulls: the Prime, the Deviants and the Eternals. Eventually, the three branches battled with one another and the Deviant branch – due to possessing the innate ability to shapeshift – were triumphant, and wiped out all members of the other two races until only two were left: the Skrull Eternal Kly'bn, and the Prime Skrull of the original non-Deviant Skrull race. Kly'bn implored them to spare his life, as killing him would kill part of their heritage. The Deviants' leader, Sl'gur't, eventually fell in love with Kly'bn, with the two eventually becoming the gods of the Skrull pantheon.