
Roger Smith
main character



Paradigm City is a place without a past. 40 years ago, something happened that wiped the memories of everyone in it. Unfortunately, the people of Paradigm City were very busy before then, making Megadueses (giant robots) and monsters. People who were born after the memory wipe are gaining/recovering memories of the past and using them to build newer threats. With the help of The Big O (a faithful giant robot), his butler Norman and the android Dorothy, Roger Smith keeps Paradigm City safe. As problems mount and more memories surface, Roger's past and Paradigm's future begin to become suspect...
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Aniphoria guide
The Big O has been well received, with an average AniList score of 74/100 — 55% of 7,430 ratings are 8/10 or higher.
It ranks #7 highest-rated anime of 1999, and #7 most popular anime of 1999 on AniList.
Of the 13.8K AniList users who started it, 5.0% dropped it, so it is dropped at a typical rate; 10.5K have finished it.
At about 5 h 12 min in total, it is a short commitment — a weekend binge.
Best for viewers who enjoy Action, Mecha, Mystery — especially super robot, amnesia, philosophy, noir.
26 episodes are listed.
Theme data from AnimeThemes.moe.