Big X
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Anime DetailsFINISHED

Format:TV
Episodes:59
Episode Length:25 mins
Season:SPRING 1964
Source:manga
Estimated watch time
24h 35m
⚡ 12 days at 5 eps/day

Tags & Tropes

Shounen79%Historical79%Achromatic79%Super Power79%
TVFINISHED1964 SPRING5.2 / 10 AniList score

Big X

ビッグX
overview details

Synopsis & Story

Invited to Nazi Germany during World War II, Dr. Asagumo is asked by Hitler to collaborate with him on the research of the new weapon "Big X". Concerned about the possible effects of the completion of Big X, Dr. Asagumo intentionally delays the progress of the research, conspiring with his co-researcher, the devious Dr. Engel. Immediately before Germany is defeated by the Allies, Dr. Asagumo implants a card inscribed with the secret of Big X in his son, Shigeru, and is then shot to death by the German army. Twenty years later, the card is discovered in the body of Shigeru, who is then living in Tokyo. Soon, an organization claiming alliance with the Nazis appears, steals the card, and completes the Big X project. Dr. Engel's grandson has joined the Nazi Alliance. The completed Big X is then revealed to be a drug that can expand the human body without limitation. Recovering Big X from the enemy, Shigeru's son Akira fearlessly challenges the Nazi Alliance and Hans Engel, who are plotting to conquer the world. Note: Most of the series is lost media. Only episodes 1, 11, 12 & 40-59 are known to still exist.

Where to Watch Officially

A streaming link is not listed for this title yet.

Franchise Universe & Related Entries

Aniphoria guide

Big X: should you watch it?

At a glance

Big X has been poorly received, with an average AniList score of 52/100 — 39% of 121 ratings are 8/10 or higher.

Of the 370 AniList users who started it, 31.1% dropped it, so it is frequently dropped; 160 have finished it.

At roughly 24 h 35 min in total, it is a long commitment — about 4 weeks at an hour a day.

Best for viewers who enjoy Action, Sci-Fi — especially shounen, historical, achromatic, super power.

Episodes

59 episodes are listed.

Main cast & creators

Original creator
Osamu Tezuka
Director
Osamu Dezaki

Opening & ending themes

Openings

  1. OP1“Big X” by Kamitakada Shounen Gasshoudan

Theme data from AnimeThemes.moe.

Big X FAQ

How many episodes does Big X have?
Big X has 59 episodes of about 25 minutes each, roughly 24 h 35 min in total.
How long does it take to watch Big X?
About 24 h 35 min back to back. At two episodes a day it takes 30 days; at one hour a day, about 25 days.
Is Big X finished?
Yes. Big X has finished airing — the final episode aired September 27, 1965.
Is there a season 2 of Big X?
No sequel is listed for Big X as of October 2026. You can continue the story in the original manga.
Is Big X based on a manga?
Yes. Big X adapts the manga by Osamu Tezuka.
Who sings the opening of Big X?
The opening, "Big X", is performed by Kamitakada Shounen Gasshoudan.