Brainiac 5 is Querl Dox. He is a superhero.It was later revealed that, even amongst Coluans, Querl Dox had been something of a loner, due to his even higher intelligence, interest in practical experiments rather than pure thought, and lack of concern about the consequences of his experiments.Brainiac 5 was one of a number of Legionnaires who were trapped in the 20th century. While in the 20th century, he also encountered his ancestors, Brainiac, as well as Supergirl. He was attracted to Supergirl.Brainiac 5 possess a 12th-Level Intellect, which grants him superhuman calculation skills, amazing memory and exceptional technical know-how. By comparison, 20th century Earth as a whole constitutes a 6th-Level intelligence, and most of his fellow Coluans have an 8th-Level intelligence.He is a member of the Legion of Superheroes.