 If you liked
Kidou Senshi Gundam I
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 ...then you might like
Aldnoah.Zero
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A/Z is essentially a retelling of the Gundam premise: Earth colonies in space develop their own identity, start a war with earth over independence and resources, drop a giant satellite on earth and start having the upper hand in a war due to their superior mecha, as well as the main plot being our main cast having to "deliver something" whose delivery could possibly stop the war and having a cast of youngsters being embroiled into a war setting.
Of course, they also differ in many factors, such as A/Z's enemy mecha more closely resembling what one would find in super-robot (As opposed to real-robot) anime,
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