Black Bolt (Blackagar Boltagon) is a fictional character appearing in American comic books published by Marvel Comics. Created by Stan Lee and Jack Kirby, the character first appears in Fantastic Four #45 (December 1965). Black Bolt is the ruler of the Inhumans, a reclusive race of genetically altered superhumans. Black Bolt's signature power is his voice, as his electron-harnessing ability is linked to the speech center of his brain. Speaking triggers a massive disturbance in the form of a highly destructive shockwave capable of leveling a city. Due to the extreme danger posed by this power, the character has undergone rigorous mental training to prevent himself from uttering a sound, even in his sleep, and he usually remains completely silent and speaks through sign language or via spokesperson.
The character of Black Bolt has featured in other Marvel-endorsed products such as arcade and video games, animated television series, and merchandise such as trading cards. He made his live-action debut in the Marvel Cinematic Universe with the television series Inhumans, portrayed by Anson Mount.