A destitute settler scratching a living in the desert of Nimbus III, who becomes Sybok's first convert in 2287 after the Vulcan draws out his pain.
J'onn appears in the opening scene of Star Trek V: The Final Frontier. He is digging holes in a field of dust on the so-called Planet of Galactic Peace when a rider comes out of the haze. J'onn levels a crude gun at him.
The stranger, Sybok, speaks to him gently and offers to share his pain. Whatever passes between them leaves J'onn weeping and then at peace, and he pledges himself to Sybok's quest.
He goes on to serve in the ragged army that takes Paradise City and its three consuls hostage. J'onn was played by Rex Holman, who had appeared in the original series as Morgan Earp in Spectre of the Gun.