The Open Door is the first episode of the series Ninja Robots. It first aired on October 6th, 1985.
Summary[]
Having just turned 16 years old, Joe Maya is put to work doing heavy labor on Mars. He's the son of Matsuo, a criminal who was forcibly sent to Mars and took him along. Joe has been on Mars since he was little and idolizes the Earth which he only barely remembers. One day, during a run from the mars police along with his brother Mike he gets caught up in a battle between alien forces...