Heavy is the debut studio album by the rock band Iron Butterfly, released in early 1968. The first two tracks, "Possession" and "Unconscious Power", were released as the respective sides of a single. Three of the group's members (Jerry Penrod, Darryl DeLoach and Danny Weis) left the band shortly after the album was recorded, leaving Ingle and Bushy to find replacements. Despite being a debut album with no hit single to provide an entry point for the casual listener, Heavy was a commercial success, reaching #78 on the Billboard Charts and eventually going Gold in the US.