After colonizing the planet Solo of the Andromeda galaxy, earthling scientists uncover ancient mechanisms built by a lost nation from long ago. They find that these mechanisms can combine to create a giant mecha called Ideon. They name this vanished nation the Sixth Civilization as it is the sixth example of intelligent alien life the human race has encountered. What the earthlings do not realize, however, is that they are soon to encounter the seventh: the Buff Clan, humans from a world other than Earth who have come seeking a legendary power source known as the Ide. Fortuitously, just as first contact with the Buff Clan turns violent, the earthlings assemble Ideon and discover the ancient robot is powerful enough to protect them. But is Ideon in fact the power source of legend, and what is the extent of its might? The earthlings can only hope to discover the answer before it is too late.
It is Universal Century 0079, a time when the Earth Federation and the Principality of Zeon are locked in a bitter war over independence. Having just completed the prototype mobile suits known as Gundam, the space colony Green Noah finds itself under attack from the enemy – inadvertently plunging fifteen-year-old Amuro Ray into the cockpit of a Gundam. Now assigned to the new assault carrier White Base, both Amuro and other Gundam pilots must survive the vicious battles of Zeon as the war rages on. Amuro will soon see the true nature of war; will it consume him, or awaken something from within?
Because, hey, you want the movie version. These anime films condense a bulk of the narrative of their respective TV shows, also providing some improved animation - particularly for the mecha battles. Removed from the requirement to deliver another mecha sequence every twenty minutes, the anime based on these programs are free to focus on the arc and story perhaps a trifle more directly then the source material.
As for the stories themselves, well, in either film there's the antagonists who attack the home of our heroes, resulting in them escaping with a mecha and on a spaceship, and then much confrontation and melodrama ensues. Particulars are different but tone is the same.