Big X poster
TV Series Finished Spring 1964

Big X

ビッグX

Action Sci-Fi
★ 5.3AniList score
59Episodes
25 minPer episode
MangaSource

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,… Read more

Storyline

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.

Trailer

Characters & Japanese Voice Cast

Big X Big X Main VA: Akira Shimada
Akira Asagumo Akira Asagumo Main VA: Yoshiko Oota
Irina Engel Irina Engel Supporting VA: Mariko Mukai
Nina Belton Nina Belton Supporting VA: Fuyumi Shiraishi
Hans Engel Hans Engel Supporting VA: Keiko Yamamoto
Dr. Hanamaru Dr. Hanamaru Supporting VA: Ichirou Nagai
Shigeru Asagumo Shigeru Asagumo Supporting VA: Hiroshi Nakano
Akira no Haha Akira no Haha Supporting VA: Tomoko Watanabe

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Frequently Asked Questions

How many episodes does Big X have?

Big X has 59 episodes.

Facts from AniList (also listed on MyAnimeList); streaming availability from JustWatch India. Last updated 18 October 2026, 7:56 AM IST. Episode times are Japan broadcast times shown in IST. Spotted a mistake? Write to [email protected].