Tars Tarkas (Willem Dafoe) is a fierce green Martian warrior who is the Jeddak (King) of the Tharks. The last vestige of nobility runs in his blood and is the only thing that keeps the Thark tribe from turning into beasts. Blessed with a good sense of humor and patience, Tars Tarkas befriends the earthman John Carter and gives him the Thark name Dotar Sojat, which roughly translates as "my right arms."