Tomar-Re is a Xudarian, a race of aliens from the planet Xudar in Sector 2813. He was a scientist on his homeworld before joining the Green Lantern Corps and becoming the Green Lantern of Sector 2813. Tomar-Re became a pivotal member of the Corps, training new members, like Arisia, and serving in the Honor Guard. He was close friends with Abin Sur, Green Lantern of neighboring sector 2814. He was also the first Lantern to meet Sur’s replacement, Hal Jordan, and the two got along equally well. They first met in Green Lantern #6 (March 21, 1961) when Tomar contacted Green Lantern about a threat to a world in his sector, which was happening at the same time alien invaders were attacking Tomar’s world. Hal stopped the threat, then helped Tomar defeat the invaders, who hastily left the world. Hal first found out about the Guardians from Tomar, who mentioned they wanted the Green Lanterns to be equal which is why the Power Battery recharges their rings for the same time period.