Akira Toriyama’s Dragon Ball has continued to tell powerful stories across more than 600 episodes between its many series. Dragon Ball Z, the franchise’s first sequel, tends to receive the most attention due to its more adult storytelling, longer length, and greater focus on action. However, Dragon Ball Z doesn’t just wipe the slate clean and begin anew. All of the series’ developments are a careful response to what’s already been established in the original Dragon Ball.
Source：https://www.cbr.com/dragon-ball-characters-that-changed-the-most-in-dbz/
