In "Queen of the Martian Catacombs" (1949), Brackett created the character of Eric John Stark. Stark, an orphan from Earth, is raised by the semi-sentient aboriginals of Mercury, who are later killed by Earthmen. He is saved by a Terran official, who adopts Stark and becomes his mentor. When threatened, Stark reverts to the primitive N'Chaka, the "man without a tribe", who he was on Mercury. From 1949 to 1951, Brackett featured Stark (whose name echoes that of the hero in "Lorelei of the Red Mist") in three stories published in Planet Stories: "Queen of the Martian Catacombs", "Enchantress of Venus", and "Black Amazon of Mars". With this last story, Brackett's high adventure period of writing ended.