The ragged army of settlers and outcasts gathered by the Vulcan mystic Sybok on Nimbus III, who seized the planet's diplomats as hostages in order to capture a starship.
The Galactic Army of Light appears in Star Trek V: The Final Frontier. Sybok, Spock's exiled half-brother, wins over the desperate homesteaders of Nimbus III, the failed Planet of Galactic Peace, by using his telepathic gift to make each of them face and release a private pain.
In 2287 his followers storm Paradise City and take the Federation, Klingon and Romulan representatives, St. John Talbot, Korrd and Caithlin Dar, who soon join his cause. The hostage crisis is bait, and when the Enterprise-A sends a rescue party the army captures its shuttle and with it the ship.
Sybok converts much of the crew and takes the Enterprise through the Great Barrier at the galaxy's centre to find Sha Ka Ree. The being waiting there is no god, and Sybok gives his life grappling with it so that the others can escape.