This incrnation of Gundam is set in a world where humanity exists not only on earth but also in various independdent space colonies. but the existance of these colonies is threatened by the earth governement. As such the colonies recruit five young men and equip them with very advanced mobile suits to fight against the earth government and protect the colonies.
This was the first Gundam I ever watched and is still one of the best. It has a lot of politics in it even for a Gundam but somehow that works really well and makes the whole thing very enjoyable. As des the fantastic MS battles.