The Grells were rescued from their dry and dying planet by humans, only to be turned into slaves on Earth. Now the aliens are rebelling against their masters, fighting a guerrilla war against a government led by men like High Secretary Paul Kohler.
When a jet carrying Paul, his wife Olivia and their children is shot down by a missile, his Grell slaves Jesha and Ep have the opportunity to escape. Ep breaks for freedom and is killed when Paul activates the electronic slave collar that all grells must wear. Jesha, driven by his love for Paul's children Sara and Ken, stays and rescues his master's family from the jet's twisted wreckage. Despite his horror at Ep's death and Paul's brutal treatment of him, Jesha remains loyal to the humans. He rescues Sara when the rebel slave leader Shak-el captures her. Then he uses his Grell alchemy to heal Paul, who has been mortally wounded in a fire fight with a Grell rebel.
When Jesha saves Paul, however, the master becomes a half-breed; his skin changes to a mottled yellow, like a Grell's, and he is able to see ultraviolet light by day and heat at night. Paul also begins to see the world from a Grell point of view. He's horrified when he comes across a rebel settlement, where men, women and children have been massacred by federal troops.
And he's terrified when a federal soldier, Lt. Lockhart, captures him and slaps a slave collar on him, believing him to be a Grell rebel. Later, Grell rebels attack Lt. Lockhart, and Paul was able to escape during the confusion. Paul reunited with his family inside a hut of the Grell village. Hidden from sight, Paul and his family sees the Grell rebels drag Jesha to the village. The rebel leader asks Jesha for the location of his master. Jesha sees the family hiding in the hut, but refuses to tell. The Grell rebel leader than uses Paul's hand remote, which fell during Paul and Jesha's fight, to make Jesha's slave collar electrocute him. The Grell rebel leader asks Jesha many times and Jesha refuses. The Grell rebel leader in tears asks Jesha "Don't you love your people?" Jesha, weakened from the torture, replies, "I love the future." With that the Grell rebel leader electrocutes Jesha beyond all medical help. Just then the village is attacked by an air strike, killing all the Grell rebels. A human military force arrived at the village. Paul and his family came out of the hut. Paul knees over Jesha, then removes his collar, telling him, "At least you die free." Jesha smiles and passes away. Paul orders the Colonel in charge of the military unit to give proper burials to all the Grells that had died.