Getter Robo Manga
Manga
I organized this list with the main timeline stuff first, the spin offs second and the crossovers last.
Manga, 3 vol, 2007
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Happens after Go and Before Ah, it was written after the death of Ken Ishikawa from notes and is generally not considered canon
Manga, 1 vol, 2008
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A manga anthology taking place in the Getter Robo universe, written by many different mangakas.
Manga, 1 vol, 2010
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Author:6
A crossover between Getter Robo and the Devilman Franchise
Manga, 1 vol, 2011
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A crossover between Getter Robo and the Maou Dante Franchise
One-shot, ? vol, 1998
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A crossover between Shin Getter Robo and Mazinger Z/Great Mazinger franchise
Manga, 1 vol, 2002
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A large scale crossover between Getter Robo/ Getter Robo G and the Mazinger Z/ Great Mazinger, Grendizer, and Jeeg! franchises
