Episode Zero takes place before the events of Gundam Wing. The manga is separated into stories dealing with each of the five Gundam Pilots and Relena Darlian. Each story takes place at a different point in time before TV series. The stories deal with the early lives of the main characters from the series and reveal how each of the pilots met their respective scientists. The stories go in chronological order for each pilot ending with the launch of Operation Meteor and the beginning of the TV series.
Episode Zero reveals a generous amount of what led the five protagonists of Wing to become Gundam pilots and what occurrences shaped some of the traits they are best known for. It also features notable information on certain other key characters and events that composed the Gundam Wing story.
One of the most prominent tales of the bunch is told within Issues 2 and 3, in which it's discovered that a younger Heero once fought alongside Odin Lowe—the man who, years earlier, had assassinated the real Heero Yuy. A battlefield assault by Heero later on in the tale puts Treize in the hospital, where he would be tended to by Leia Barton—the future mother of his child (who would become the main antagonist of the Endless Waltz story that takes place years later).
The stories involving Trowa Barton and Chang Wufei are, unexpectedly enough, romantic tragedies, as each meet young women who will have significant impacts on their lives. Trowa's story also implies that Catherine Bloom, the circus performer he meets during the series, is in fact his long lost sister who he was separated from during an attack by the Alliance which presumably killed their parents.
The focus is more on origin in the cases of Duo Maxwell and Quatre Raberba Winner. Duo Maxwell is revealed to not be Duo's given name. Instead, "Duo" was bestowed on him by a childhood friend named Solo who was suffering from a dire illness, and "Maxwell" was taken afterwar from a kind priest named Father Maxwell who ran an orphanage along with Sister Helen. Sister Helen and Father Maxwell played a large role in the childhood of Duo, acting in parental roles until they and the entire orphanage were made casualties of an Alliance attack on rebels within the church despite young Duo's best efforts.
Quatre, in contrast, has possibly the least tragic past out of all the pilots. Contrary to what he believes, he is not in fact the product of test-tube reproduction (however, his many sisters are). His mother, Katherine, died in childbirth due to complications from living in space affecting the body's ability to give birth safely. As he refers to himself as a test-tube child in the series, it can be assumed his father and sisters never told him about his mother.
The histories of the two Peacecraft family members, Relena and Zechs Merquise, are unveiled as well. As the Sanc Kingdom fell, only two members of the royal family survived: Zechs and Relena. Relena was adopted by the Darlian family and raised as their own. The story implies that Relena and Zechs met prior to the Gundam Wing series which is how Zechs knew that his little sister was still alive. Also appearing in the story is a young boy who briefly attends Relena's school and resembles Heero.
Toward the end, the five heroes gather for a brief new mission that's set after Endless Waltz, an event that's anticlimactic but ends with a promising connotation. It all concludes with an affectionate parting message from writer Sumizawa himself to the fans of Gundam Wing.
There is also a bonus chapter titled "Preventer 5" which entails a short, post-Endless Waltz story involving the hostage-taking of Relena and the subsequent intervention of the Gundam pilots (which ends on a cliffhanger of sorts).
- Chapter 1: A.C.187 Duo Maxwell
- Chapter 2: A.C.188 Heero Yuy
- Chapter 3: A.C.190 Trowa Barton
- Chapter 4: A.C.191 Relena Darlian
- Chapter 5: A.C.193 Quatre Rebarbra Winner
- Chapter 6: A.C.194 Chang Wufei
- Chapter 7: A.C.195 Operation meteor
- Bonus story: A.C.197 Preventer 5
- Catherine Winner
- Father Maxwell
- Leia Barton
- Meilan Long
- Middie Une
- Odin Lowe
- Sister Helen
- Triton Bloom
- Heero Yuy
- Duo Maxwell
- Trowa Barton
- Quatre Raberba Winner
- Chang Wufei
- OZ-00MS Tallgeese
- WMS-03 Maganac
- WMS-03 Maganac Rashid Kurama Custom
- XXXG-00W0 Wing Gundam Zero
- XXXG-01D Gundam Deathscythe
- XXXG-01H Gundam Heavyarms
- XXXG-01S Shenlong Gundam
- XXXG-01SR Gundam Sandrock
Vehicles and Support Units
OZ (Organization of Zodiac)/United Earth Sphere Alliance
- Episode Zero can technically be considered semi-official, since it was originally going to be included in the Gundam Wing television series. Director Masashi Ikeda specifically asked Sumizawa to pen the main characters' back-stories, and they were to be included in the series following episode 27 ("The Locus of Victory and Defeat"). However, due to production scheduling being the "worst ever" (in Sumizawa's own words) and his withdrawing as a scenarist, Episode Zero's tale kept being delayed and pushed back. Though it was later intended to play some role in episode 31 ("The Glass Kingdom"), the problems persisted, and the Episode Zero story ended up being left out of the anime series entirely.