Invocator is a Danish thrash metal band featuring Esbjerg-based guitarist/singer Jacob Hansen, considered influential on the European thrash metal/heavy metal scene.History1988 ? Invocator?s first demo Genetic Confusion is released. The band play numerous shows. Among other supporting Artillery.1989 - Alterations, the demo that sold nearby 2000 copies, is released. The band play successful shows with bands including Entombed, Edge Of Sanity, Psychotic Waltz, Go