A giant sea monster known as "Dragonsaurus" has emerged from out of nowhere, terrorizing the depths of the oceans. Great Mazinger, Grendizer and the Getter Robo G team join forces to combat the new threat. But their task becomes more complicated when Dragonsaurus swallows up Boss Borot and makes its way toward Tokyo.

(Source: ANN)

This is the condensed theatrical adaptation of the original TV series' first season.

The Ohamami Special consisted of four independent episodes of Di Gi Charat with no continuation that aired in Spring 2001 in Japan. • Ohanami Special Episode 1 - The Evil Settles Down • Ohanami Special Episode 2 - Sakura Sakura • Ohanami Special Episode 3 - Long Haired Onii-san-nyu • Ohanami Special Episode 4 - Don`t Call me Rabi-en-Rose (Source: AniDB & Wikipedia)

Prior to the events of the anime, three factions—the Garan Army, the Kiba Army, and the Aira Army, battle for total dominance of Machine Island. The island is basically a prison, isolated from the rest of the world. The island contains a vast amount of resources, allowing the three factions to create an infinite supply of giant robots for their respective armies. The world government learns that the island's power reactor has become unstable and will explode within 66 hours, destroying all of life and Earth itself. The government sends the Death Caprice squad, composed of mercenaries Ken Kaido and Ryo Magami to solve the issue, along with their giant robot Mazinkaiser, but was that a good idea?