Shayera Hol was a lieutenant and an instructor in espionage on the planet Thanagar, engaged to be married to Thangarian Commander Hro Talak. She was sent in advance of the Thanagarian invasion as a scout to determine Earths weaknesses should Thanagar's enemies, the Gordanians, attack. Her cover story was that she was tracking criminals to their fortress when she was unexpectedly teleported to Earth. Due to her efforts during the invasion, Hawkgirl was invited aboard the Watchtower, and formed the Justice League along with Batman, Superman, Wonder Woman, The Flash, Green Lantern and J'onn.