Uchuu no Kishi Tekkaman

Earth's worsening pollution has made finding a new home for humanity a necessity, but an alien force known as the Waldaster stands in the way of escape. When the invasion takes his father from him, young Joji Minami is given the means to fight back through the transformation system that turns him into the armored warrior Tekkaman.

Launched into battle by the robot Pegas and armed with a space lance, Joji confronts the alien forces threatening humanity's future. His anger drives him forward, but the war becomes more complicated when a mysterious man from another world repeatedly appears at crucial moments, suggesting that the enemy and the wider universe hold secrets Joji has yet to understand.