The Big O

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Alternative Titles

Synonyms: Big O Roger, Big O
Japanese: THEビッグオー
English: The Big O
More titles


Type: TV
Episodes: 26
Status: Finished Airing
Aired: Oct 13, 1999 to Mar 27, 2003
Premiered: Fall 1999
Broadcast: Unknown
Producers: Bandai Visual
Studios: Sunrise
Source: Original
Genres: ActionAction, MysteryMystery, Sci-FiSci-Fi
Themes: Adult CastAdult Cast, MechaMecha, PsychologicalPsychological
Duration: 24 min. per ep.
Rating: PG-13 - Teens 13 or older


Score: 7.531 (scored by 3865738,657 users)
1 indicates a weighted score.
Ranked: #17662
2 based on the top anime page. Please note that 'Not yet aired' and 'R18+' titles are excluded.
Popularity: #2118
Members: 97,807
Favorites: 977

Available At


Streaming Platforms

Ranked #1766Popularity #2118Members 97,807
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Episodes: /26


Paradigm City, a city of amnesia and a place of belonging. It remains populated by forgotten pasts and the ruins of their labors due to a calamity 40 years ago. Shrouded in a fog-like mystery, it is up to people like Roger Smith to shine a light through the mist. Acting as a professional negotiator and suave agent, Roger is a self-tailored ladies man whose only love is for funeral black. However, as he gets deeply involved with his clients, what often starts as a simple negotiation evolves into Roger saving Paradigm from crime and peril.

In the process, Roger stumbles even deeper into the untold folds of the city. As a rule, things are hardly ever as they appear. Serving as gray knight in a gray world, Roger is not without allies. By his side are Norman, a loyal and widely skilled butler, and Dorothy, a human-like android with deadpan snark. Together with the relic Big O, a jet-black mecha of gargantuan size and weight, they help Roger serve iron justice to Paradigm's lurking villains as he discovers the truth about 40 years ago.

[Written by MAL Rewrite]

Characters & Voice Actors


Maseba, Yutaka
Katayama, Kazuyoshi
Director, Episode Director, Script, Storyboard, Screenplay
Tsuruoka, Youta
Sound Director
Nakamura, Kenji
Episode Director


Opening Theme

Apple Music
Amazon Music
Youtube Music
1: "Big-O!" by Rui Nagai (3-13)
2: "Respect" by Sahashi (15-20, 22-25)

Ending Theme

"And Forever..." by Robbie Danzie with Naoki Takao


Feb 17, 2024
The Big O remains as one of the most underrated anime’s of all time, incorporating the pros of the East and the West to create something truly magnificent. A grandiose, retro mecha-tale with one of the most unique and interesting worlds seen in anime. A high recommendation for fans of the golden age of mecha anime, following in the footsteps of Hideaki Anno’s Neon Genesis Evangelion. As my last rewatch of 2024, I can happily say The Big O has moved up exponentially on my list of the finest anime’s of all time, with my current second viewing coming 2 years after my initial discovery ...
Feb 25, 2024
Mixed Feelings
The first season functions as a pastiche of noir, giallo, mecha anime and 60s tokusatsu programs. It blends elements of pulp fiction with Lovecraftian undertones. The mostly episodic adventures range from detective fiction to kaiju and climax with a giant robot battle. The robot fights are dynamic and provide novelty by having the titular mech reveal a special move or hidden weapon to defeat each enemy.
The show drops hints about the mysteries of Paradigm city and the reasons for its’ residents losing their memory. While it never answers these questions, they mainly function to evoke a certain mood. Part ...
Aug 9, 2022
I really want to recommend this anime

Its got a lot going for it.

Great animation, great music, great action, good characters, an awesome and mysterious setting.

In fact everything is basically perfect.

So why the hesitation? It's not really something I can talk about with out spoiling the entire series and that is REALLY something I don't want to do.


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Recent Forum Discussion

Poll: Big O Episode 26 Discussion
gohdan - Mar 23, 2011
39 repliesby _Cory »»
May 18, 7:41 PM
Poll: Big O Episode 6 Discussion
gohdan - Feb 27, 2011
14 repliesby Phobossus »»
Mar 4, 5:27 AM
A dissertation and thesis on "The Big O"
LightQuill - Dec 4, 2018
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