Brainiac 5 (Querl Dox) is a fictional superhero character who exists in the 30th and 31st centuries of the DC Universe. He is from the planet Colu[1] and is a long-standing member of the Legion of Super-Heroes. The first live-action version of the character appeared as a regular character in the fifth season and a recurring character in the seventh season of Smallville, played by James Marsters. Brainiac 5 is introduced in the third season of the Arrowverse series Supergirl, portrayed by Jesse Rath. He became part of the main cast in the fourth season. A female version of Brainiac 5 from an alternate universe appeared in the fifth season of Supergirl, portrayed by Rath's sister Meaghan Rath.