It was a massive breakthrough to learn that a single mammary cell could create a clone of an entire sheep. This was not a fast process, though. Dolly was the only successful embryo out of 277 ...

So, here's why you'll probably never have to fight your evil clone. This is Dolly. Just kidding, that's a regular sheep. This is Dolly, the first mammal cloned successfully from an adult cell.

Dolly the sheep was the world’s first cloned mammal in 1996. Her death at a comparatively young age raised concerns that cloned animals may age more quickly, or make them less healthy ...