Astroganger

is a Japanese Super Robot anime series created by Knack Productions. It originally broadcasted on Nippon TV from October 4, 1972 to March 28, 1973 for 26 episodes.

Plot
An alien woman named Maya crash-lands on Earth after her homeworld was destroyed by the Blasters, a cruel alien race who steals the natural resources from other planets. She falls in love with a scientist and gives birth to a human boy named Kantaro. When the Blasters invade the Earth, Kantaro must defeat them by fighting with Astroganger, a robot made from living metal.