"Mobil Suit Gundam: The Origin" is a prequel to the original 1979 "Mobile Suit Gundam" series, offering a detailed backstory to the Universal Century timeline. The narrative primarily focuses on the early lives of key characters and the events leading up to the One Year War. Central to the story are Char Aznable and Sayla Mass, siblings whose real names are Casval Rem Deikun and Artesia Som Deikun, respectively. Their father, Zeon Zum Deikun, is a political leader advocating for space colonization independence, whose assassination sets the stage for political upheaval.

The series delves into the power struggle within the Zabi family, who seize control of the Principality of Zeon after Deikun's death. Casval and Artesia are forced into hiding, with Casval adopting the alias "Char Aznable" and vowing revenge against the Zabis. The story explores Char's transformation into a cunning and skilled pilot, as well as his complex relationships with other characters, including his mentor, Ramba Ral, and his eventual rival, Amuro Ray.

Parallel to Char's journey, the series provides insight into the development of mobile suit technology, particularly the creation of the RX-78-2 Gundam. The political tensions between the Earth Federation and the Principality of Zeon escalate, culminating in the outbreak of the One Year War. The narrative also highlights the ideological conflicts and personal vendettas that drive the conflict, offering a deeper understanding of the motivations behind key figures.

The animation blends traditional 2D art with modern CGI, enhancing the visual storytelling without overshadowing the plot. The series maintains a strong focus on character development, political intrigue, and the moral ambiguities of war, staying true to the themes of the original "Mobile Suit Gundam" while expanding on its lore. By the end, "Mobil Suit Gundam: The Origin" provides a comprehensive foundation for the events of the original series, enriching the viewer's understanding of its universe and characters.