Tosho Daimos (1978)

The survivors of Planet Baam and the Earth people want to sign a peace treaty, so General Lion and the reknowned scientist Dr. Ryuuzaki head out to have a reunion. But Lion dies in odd circumstances, his vengeful son Richter kills Dr. Ryuzaki - and war starts. Dr. Ryuzaki's son, young martial artist Kazuya, decides to defend Earth with Dr. Izumi's powerful robot: Tosho Daimos...