Monstrum is a Polish heavy metal band formed in 1994 in the city of Rzeszów by Mariusz Waltos (vocals), Waclaw Dudek (guitar), Tomasz Maternowski (bass) and Piotr Kubas (drums). During this line-up they haven't released any materials In 1996 Tomasz Maternowski left the band and he was replaced by the vocalist. Also Pawel Guzek joined as a second guitarist. In 1997 Piotr Kubas left and was replaced by Wojciech Bartnik.

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