Chag Gara was a local religious leader on the planet Kyros. Born in 2226, he was well known in the city of Andros as a rampant womanizer. He believed himself to be the sole messiah of the gods who lured followers in with promises of houris in the afterlife.

The library computers on board the USS Enterprise described Chag Gara as a "mentally disturbed fanatic with low intelligence and an inability to order his thoughts." It also found that, in the history of the United Federation of Planets, individuals such as Mohammed, Stur, and Nerid matched Chag Gara's psychological profile.

In 2269, he and Spock were mentally linked using a telescan cephalic implant which enabled Gara to use Spock's intellect to further his ambitions. The crew of the Enterprise recovered Spock from Gara and used radical therapy to "cure" him. (TOS novel: Spock, Messiah!)