Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster
Grendizer, Getter Robo G, Great Mazinger: Decisive Battle! The Great Sea Monster is not streaming on a US subscription app right now, as of October 5, 2026.
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 towards Tokyo. Source: ANN
Where to watch
Not currently available for streaming in the US.
9 apps, one package.
This title is not on an app included with Spectrum, but Spectrum Stream TV Signature includes HBO Max, the Disney+ and Hulu bundle, Peacock, Paramount+ and more. Spectrum Internet is required and sold separately.
What if half your apps were already included?
See which ones Spectrum covers and what you’d actually save. No login. No email. Just math.
