Demon of Steel: Battle of the Great Demon Beasts (1987)
Original title: 大魔獣激闘 鋼の鬼
Demon of Steel: Battle of the Great Demon Beasts is a 1987 Japanese-language animation movie directed by Toshiki Hirano, with a running time of 1h. It stars Kazuhiko Inoue, Sakiko Tamagawa and Toshio Furukawa.
In the year 1999, a team of UN scientists in an attempt to tap into a new energy resource on a deserted island called Samsara, unknownigly open a portal to another universe, unleashing dormant biomechanical entities. Three years later, Takuya Goroza returns to the island of Sansara urged by a mysterious request by college chum Haruka Alford. Little does he know, his old friend isn't what he appears to be...