Brain Wave honed his mental abilities to perfection, enabling him to hypnotise people effortlessly, and to project realistic three-dimensional images. King went on to marry the heroine known as Merry "the Girl of a 1,000 Gimmicks" and they had a son, Henry King Jr, who became Brainwave Jr. After first joining and then being betrayed by the Ultra Humanite in his version of the Secret Society of Super Villains, King died protecting his son from the brutal albino gorilla villain. As a final gesture of paternal love for his son, King transferred the bulk of his awesome mental powers to him. Brain Wave has been identified as one of the deceased entombed below the Hall of Justice.