Bouken Shounen Shadar
Adventure Boy Shadar
冒険少年シャダー
When Earth is threatened by the invading Ghostar, a young boy with nerves of steel and the strength of 50 men appears from a cave on Mount Fuji. He is Shadar, a boy of unknown origin who, with his faithful dog, Pinboke, fights to save the world.
(Source: The Anime Encyclopedia)