 If you liked
Kidou Senshi Zeta Gundam
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 ...then you might like
Code Geass: Hangyaku no Lelouch
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Sunrise didn't only incorporated elements from Zeta Gundam into Code Geass, but from the entire Universal Century Gundam Franchise. So if you like the mechas, the conflics and most important: the politics in Code Geass you will definitly like Zeta Gundam which has by far the best war story the Sunrise has ever produce.