Sister was an American heavy metal band, formed in 1976 in Los Angeles. Former members included Blackie Lawless, formerly of the New York Dolls and later of W.A.S.P., and Nikki Sixx, who would later co-create Mtley Cre. They are notable for being one of the first bands to make usage of the pentagram and other occult symbols. Due to the late 1970s music scene, and personal differences, they never achieved success and broke up sometime in 1978. Sixx and guitarist Lizzie Grey later formed the band London.