What is the Saiyan Saga?
Five years after the manga's tournament finale, a stranger falls from the sky, calls Goku his brother, and kidnaps Gohan. Raditz's arrival rewrites everything: Goku is a Saiyan sent to Earth as a baby, the tail and the giant ape form were alien biology, and stronger Saiyans are coming. Goku dies holding Raditz for Piccolo's killing shot, the first hero death of the Z era, and it is played as strategy rather than tragedy because the Dragon Balls can reverse it once.
The year of training that follows is the arc's real substance. Gohan survives in the wilderness under Piccolo, who softens from demon to mentor and dies shielding the boy from Nappa, the emotional hinge of the whole franchise. Yamcha, Tien, Chiaotzu, and Piccolo all fall before Goku returns, and the duel with Vegeta, beam struggle, giant ape, and all, ends with the villain spared at Krillin's mercy, a decision the next arc immediately tests.
In print, these chapters sit in the middle volumes of the same 42-volume manga; Japan never split the book, only the anime took the Z name. That is why Japanese tankobon and kanzenban covers for this stretch still say Dragon Ball while Western Z-branded editions say Dragon Ball Z, a labeling split explained in the Library's page on the anime split.
As collectibles, the Saiyan volumes are the most common entry point for Western buyers moving to Japanese editions, because the covers differ visibly from the Viz Z volumes and the kanzenban printing gives the Vegeta fight larger, cleaner art. Anime collectors meet the arc in more home video editions than any other, from the cropped Orange Bricks to the Dragon Box, compared in the Library's home video page.
