After the rebel cell known as the Spectres visited Osisis Station to acquire ship parts from Vez, he challenged Hera Syndulla to a race in the Fool's Run. During the race, Vez attempted to use asteroid thrusters to sabotage the Ghost, but Kanan Jarrus and Ezra Bridger used the Force to move asteroids into the path of Vez's fighter, the Splendour. The distraction allowed Syndulla to win the race, but Vez still refused to give them the parts they wanted, threatening to hand the rebels over to the Galactic Empire. However, the Spectres managed to take out Vez's guards, and forced him to give the parts to them.
The ringed planet first appeared in the 2015 canon comic "Ring Race," written by Martin Fisher, illustrated by Bob Molesworth and published in Star Wars Rebels Magazine 1.