Brainiac 4 is the name of two fictional characters appearing in American comic books published by DC Comics.

Fictional character biography

Pre-Zero Hour/Post-Infinite Crisis

The Silver Age version of Brainiac 4 is Kajz Dox, the father of Querl Dox (Brainiac 5), who died when Querl was a child.

Post-Zero Hour

The second Brainiac 4 first appears in Legion of Super-Heroes #107 (August 1998). This incarnation is Brainiac 5's mother and the leader of the Dark Circle who joined them to alleviate her longtime lack of emotion. After being defeated by the Legion, she is committed to an asylum. In Mark Waid's Legion of Super-Heroes reboot, Brainiac 4 is one of several Coluans who are infected with a mind-altering illness during an attack on the United Planets.

In other media

Brainiac 4 appears in Legion of Super-Heroes (2023), voiced by Robbie Daymond. This version is a clone of Brainiac and member of the Dark Circle who was created to steal the Miracle Machine. After his failure to do so, Brainiac fuses him into himself, but Brainiac 5 later manipulates Brainiac 4 and his fellow clones into fighting and killing one another from the inside.