'The Adventures of Chris KL99' first appeared in Strange Adventures #1. With a slight name change to KL-99 from issue #2, he made eight appearances in the title in total - issues #1-#3, #5, #7, #9 and #11, ending with Strange Adventures #15, all written by Edmond Hamilton and drawn by Howard Sherman. Since then, a brief appearance in DC Comics Presents #78, a cameo appearance in Crisis on Infinite Earths #10, and a brief but completely revised origin story in Secret Origins #43 have been his only other appearances to date.
According to his early adventures, Chris KL, the son of Jon ST-94, was born on a spaceship somewhere between Earth and Mars, the first Earth child to be born in outer space, in the 21st century, and was named after Christopher Columbus. He became an instant celebrity, but was kidnapped by aliens on his eighth birthday and not returned for nine years. It turned out that the aliens were a dying race, and chose him to train for some still unknown purpose. They had not meant to kidnap him, but were unable to communicate their wishes to anyone else. After his return, his parents left Earth to find new worlds to colonize on the exploratory spaceship 'The Starfarer', and were not seen again. According to one version of his story, Chris then vowed to go toSpace Academy so he could journey to find them when he was older, and after graduating from Space Academy '99' was appended to his name because of his 99% rating at the Academy, and he later became the greatest space explorer of his day. Another version of Chris's story has him not returning to Earth, but traveling in space to find the last surviving aliens to continue his training with them, appending the KL to his name in honor of the alien race, the K'l, and the 99 in acknowledgement that there were only 98 of the aliens left alive when he was with them. Whatever the correct version, accompanied by Halk, a Martian scientist, Jero, a Venusian, and a pet chameleon dog, Loopy, whose color changes according to his mood, he discovered many alien worlds in his spaceship 'The Pioneer'. In recognition of his work, he was given the authority to protect the people of the new worlds he discovered from danger as 'Commissioner for Protection of Planetary Peoples'. Chris eventually found 'The Starfarer' and his parents' graves on the planet where they had died saving the rest of the crew in a crash. Other adventures involved saving the ancient Earth monuments from aliens in need of metal to save their universe, and rediscovering a second moon that used to orbit Earth millions of years ago. He was present during the DC UniverseCrisis on Infinite Earths, first in his own time to help Superman and the Forgotten Heroes defeat the Forgotten Villains at the start of the Crisis, and then towards the end of Crisis to help with powering the time machines critical to saving the universe.
