Ah finally. A worthwhile Gurepala Works to watch.
This final one (IIANM) details Lordgenome’s rise to become a Spiral warrior when the anti-Spirals started their conquest of the universe. Of course, the rest is history, but I have to say, his resemblance to Nia when he was young is a bit disturbing to say at least. It seems we’ll also be seeing some footage of the sort in the Gurren Lagann movie, which is already airing in Japanese screens, and probably will take a while more to reach the international audience :P.