Krang is a character debuting in the 1987 animated series as the disembodied brain of an evil alien warlord from another dimension and an antagonist of the Ninja Turtles. He retains this backstory for most early incarnations, although in later incarnations he is presented as an Utrom. Krang is a supervillain appearing in the Teenage Mutant Ninja Turtles TV shows and most frequently in the 1987 cartoon and its associated media, such as the Teenage Mutant Ninja Turtles Adventures comic book and most of the classic TMNT video games.
Krang's first comics appearance was in Teenage Mutant Ninja Turtles Adventures vol. 1, #1, published by Archie Comics in August 1988. In the 1987 TV series, Krang was voiced by Pat Fraley. He is still one of the primary antagonists to the Ninja Turtles, appearing as General Krang in the 2012 IDW comic publication, and as Kraang Prime in the 2012 Nickelodeon cartoon.