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Fifth grader Seiji was just a normal kid, until he became pulled into a conflict of galactic proportions! A UFO attacked his town one day, and after hearing a voice speak to him, he found himself in the company of a police car-turned-robot named Da Garn. It is one of eight Brave Fighters who have protected Earth since its infancy – all of which became Brave Stones and are scattered throughout the planet. It’s up to Seiji to find and awaken the other Brave Fighters, command Da Garn to battle the alien invaders, and keep his secret safe from his classmates!
Both shows revolve around a struggle for special totems (stones in the case of Da-Garn, discs in the case of Go!) which awaken & control giant transforming robots. Both shows feature young boys as the leaders of the heroic groups, and have very similar designs for the heroic mecha. While these two shows are so similar that it's scary, the similarities between them is less surprising when you realize that the Brave series were based on designs originally intended for Transformers decades ago.