"Mobile Suit Gundam: The Origin Movie Edition" is a recompilation and adaptation of the original "Mobile Suit Gundam: The Origin" OVA series, which serves as a prequel to the iconic 1979 anime "Mobile Suit Gundam." The story delves into the events leading up to the One Year War, focusing on the political tensions between the Earth Federation and the Principality of Zeon, as well as the personal histories of key characters.

The narrative begins with the rise of Zeon Zum Deikun, the founder of the Principality of Zeon, who advocates for the independence of space colonies from Earth's control. His assassination sets off a chain of events that leads to the rise of the Zabi family, who manipulate Zeon's ideals to consolidate power and declare war on the Earth Federation. The political intrigue and power struggles within Zeon are central to the story, highlighting the ambitions and moral compromises of its leaders.

Central to the plot are the lives of Char Aznable and Sayla Mass, siblings whose real names are Casval and Artesia Deikun. After their father's death, they are forced into hiding, with Casval adopting the alias Char Aznable. Char's journey is marked by a desire for revenge against the Zabi family, whom he holds responsible for his father's death and the suffering of his family. His cunning and strategic brilliance make him a formidable figure in the conflict. Meanwhile, Sayla lives under the protection of the Mass family, unaware of her brother's activities until later in the story.

The series also explores the development of mobile suits, the advanced humanoid weapons that become pivotal in the war. The prototype Zaku, designed by Zeon, is showcased as a precursor to the more advanced mobile suits that dominate the battlefield. The technological advancements and their implications for warfare are a recurring theme, emphasizing the escalating arms race between the two factions.

The Earth Federation, initially portrayed as complacent and unprepared, begins to recognize the threat posed by Zeon. Key figures within the Federation, such as General Revil, play crucial roles in rallying Earth's forces and developing countermeasures, including their own mobile suits. The political and military strategies of both sides are intricately woven into the narrative, providing a comprehensive backdrop to the personal stories of the characters.

The "Movie Edition" condenses the OVA series into a more streamlined format, focusing on the most critical events and character developments. It retains the core themes of betrayal, revenge, and the human cost of war, while also setting the stage for the events of the original "Mobile Suit Gundam" series. The adaptation serves as both an introduction for new viewers and a deeper exploration for longtime fans, offering a detailed look at the origins of the conflict and the motivations of its central figures.