Androx was a robot created by the Japanese Military in World War II to fight the Americans but it was destroyed when America found out about the plan. 


Androx's remains after it was destroyed, were thrown into the Arctic Ocean and were frozen.  Many years later, the remains of Androx were found by a submarine and scientists established Operation: Androx Reborn, an operation where Androx would be reborn so he could destroy Godzilla.  Instead of fighting Godzilla, Androx went on a rampage and attacked Tokyo.  He was disturbing Godzilla's peace, as he could hear his rampage from Monster Island.  Godzilla decided to go and destroy Androx but Androx was too powerful.  Jet Jaguar and Mothra helped Godzilla defeat Androx and his robot body was destroyed for good.