Kyron 4 was the fourth planet in its star system. The surface of the world experienced dangerous ion storms that could last for years.
In 2381, Lieutenant jg Brad Boimler and Lieutenant Steve Levy were assigned to a routine dilithium survey on Kyron 4. During the away mission, they were forced to shelter inside a cave by a sudden ion storm. After finding a suspiciously convenient ground vehicle that could accommodate only a single occupant, they discovered that the situation had been engineered as a morality test by the Vendorians. The two managed to establish a rapport with the Vendorians thanks to Levy's knowledge of their culture, and ultimately pass the morality test by rising above their earlier interpersonal strife. (LD: "Caves")