General Grievous is the cyborg Supreme Commander of the Droid Army featured in Star Wars: Revenge of the Sith. Now mostly robot, Grievous was originally biological, a Kaleesh from the planet Kalee. Near death, Grievous' heart, lungs, brain, and eyes were transplanted into a droid-like frame. The most notable feature of his cyborg design is the arms, which can split into two sets. Given his half-biological make up, Grievous is still able to use Force powers.