Gnarrk is a caveman superhero often associated with the Teen Titans. Originally, Gnarrk was a 17-year-old caveman whom Mal Duncan and Kid Flash encountered on a trip to the Stone Age and accidentally brought back to the present day. The Titans taught Gnarrk how to fit into their contemporary society and gave him the name John Gnarrk. Gnarrk's history has changed over time - becoming a benevolent caveman trapped in ice after the Crisis on Infinite Earths. In the New 52, Gnarrk's origin more closely resembles his original Earth-One counterpart, having been civilized in modern society by the Teen Titans.