Crossover one-shot between Mazinkaiser and Shin Getter Robo. It was included in Immortal Super Robot Encyclopedia (不滅のスーパーロボット大全). 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. (Source: Mazinger Wikia)

The hero, Tomoe Dango, a manly man, engages his family and friends in a slapstick drama of everyday life. (Source: Wikipedia Japan, translated)

Zero is a wild dog who is saved by a boy named Taro after making enemies with hunters. Their carefree days of living on the streets are interrupted when Zero undertakes a journey to sharpen his fangs.

Insects all over the world begin to swarm for unknown reasons, with other animals and plants acting strangely as well. To investigate this, Takuya Kai is dispatched with an Earth Academia group. Investigating independently, Takuya finds Guru who reveals that insects are preparing for battle against invaders from another dimension. Offering their aid, the Earth Academia create suits of armor to combat the threat as the Jamahl arrive to Earth to enslave humans. Though they have trouble perfecting the Bio-Machinery, Guru arrives to infuse the armor with the life force of many insects. Once the suits become the B-Commanders, one suit chooses Takuya while the other two bond to Daisaku Katagiri and Rei Hayama. With their newfound power, the B-Fighters fight to drive back Jamahl's forces.Five years after the destruction of Jamahl, Earth has returned to peace again. The Earth Academia has become the Cosmo Academia (コスモアカデミア, Kosumo Akademia), a scientific research organization, where Takuya Kai works with Sage Guru on a new generation of Insect Armor in the event of another threat to the Earth. P.S. The action footage and props of TV Series were used for Saban's U.S. tv shows Big Bad Beetleborgs and Beetleborgs Metallix