Space Emperor God Sigma

Curtis Newton, aka Captain Future, is an orphan. His parents died in their artificial satellite while he was an infant. His father was a scientist, who has abandoned earth for the satellite to dedicate his life for science along with his aging friend the genius Dr Simon Wright. Wright senses his death, and decides to implant his brain in a mechanical container. They both manufactured a superior robot and an android. Captain future dedicated his life to fight evil along with his three men, the brain, android, and robot.

Hiroshi Shiba is a car racer who is mortally wounded in a laboratory accident, but restored to life by his father, Professor Shiba.

After Koji Kabuto and Sayaka Yumi leave to the USA, it's up to the rash orphan Tetsuya Tsurugi to pilot the next Mazinger robot: the Great Mazinger. Under the direction of Dr. Kenzo Kabuto and helped by his adoptive sister Jun Honou, Tetsuya battles the Miccene Empire.

In the near future, humanity has taken its first steps towards journeying into the far reaches of the galaxy. Upon doing so they discover a huge race of insectoid aliens known as "Space Monsters." These aliens seem dedicated to the eradication of mankind as they near closer and closer to discovering Earth. In response, humanity develops giant fighting robots piloted by hand-picked youth from around the world. Shortly after the discovery of the aliens, Noriko Takaya, the daughter of a famous deceased space captain, enters a training school despite her questionable talents as a pilot. There, she meets her polar opposite, the beautiful and talented Kazumi Amano, and is unexpectedly made to work together with her as they attempt to overcome the trauma of war as well as their own emotions.