The SU-152 (СУ-152) was a Soviet self-propelled heavy howitzer used during World War II. It mounted a 152mm howitzer on the chassis of a KV-1S heavy tank. Later production used the IS tank chassis and was re-designated as ISU-152. Because of its adopted role of as an impromptu heavy tank destroyer, capable of knocking out the heaviest German armored vehicles—Tiger and Panther tanks, and Elefant tank destroyers—it was nicknamed Zveroboy, "beast killer".