Mazinkaiser vs Shin Getter Robo

Crossover one-shot between Mazinkaiser and Shin Getter Robo. It was included in Immortal Super Robot Encyclopedia The manga begins with the Mazinger Z and Great Mazinger fighting against an alien machine after the Diana A and Venus A have been taken down. Part of the [Getter Robo](https://mangadex.com/?page=search&title=Getter%20Robo) series.