Tahr is the former apprentice to the Green Lantern Wylxa. He was a constant source of disappointment to his master. He considered quitting many times in his early years as a Green Lantern until he realized that to be a successful Green Lantern, he could not be afraid of failure. Following the death of Wylxa during the Crisis, Tahr was to be reviewed as a Green Lantern by Gk'd of Fy'p.