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Daitetsujin 17 (大鉄人17, Daitetsujin Wan-Sebun) is a 1977 tokusatsu series created by Shotaro Ishinomori and produced by Toei. It revolves around a giant battle robot commanded by a young boy who fights the giant robots of an evil organization bent on world conquest. It is similar to Giant Robo (show) in premise and how it ends.

Several episodes were edited into a TV movie shown in the United States under different titles, including The Defenders and the Great Brain and Brain 17.

The opening theme was performed by Ichirou MizukiKoorogi '73 and The Chirps.

Popy manufactured several toys based on the series - notably a transforming Chogokin version of the robot One-Seven (later released in America for the Godaikin line), vehicles based on One-Seven's Flying Fortress mode, the Sub Machine Flying Car, the Shigcon Tank and the Shigcon Jet, and a three-inch version of One-Seven, which was later released as "17" in Mattel's Shogun Warriors line.

On April 2020, Daitetsujin 17 became one of the 70 shows to stream on the Toei Tokusatsu World Youtube channel.


Brain is the world's greatest computer, and also the most intelligent being on planet Earth. One day, Brain decides to abandon its terrestrial moorings, and it's up to The Defenders to track it down. Unfortunately, Brain has developed an amazing army of deadly giant robots, including one with a huge "17" emblazoned on its chest-plate, with which it plans to subjugate its creators. A young boy whose family was killed by Brain's followers manages to activate Daitetsujin 17, which thereafter comes to his rescue whenever he is in danger from Brain's minions.


Daitetsujin17 17
18 18


  • Red Muffler Corps
    • Dr. Sahara
    • Captain Nakai
    • Captain Tamotsu Kenmochi
  • Tetsugoro Iwayama
  • Rumi Sahara


Enemy Robots

  • Roller Robot
  • Hurricane Robot
  • Earthquake Robot
  • Refrigeration Robot
  • Gastank Robot
  • Mixer Robot
  • Cannon Robot
  • Oguri Robot
  • Battleship Robot
  • Bacterial Robot
  • Shinkansen Robot
  • Building Robot
  • Bill Robot
  • Harken Killer
  • Brain Crocodile
  • Robo Nessie
  • Hastler Fortress
  • Mirage Satellite Tiger
  • Gold Nessie


  • Minami Saburo - Masahiro Kamiya
  • Chie Sahara - Midori Takei
  • Dr. Sahara - Tadao Nakamaru
  • Captain Kenmochi - Go Haraguchi
  • Muranaka - Shungo Mitsui
  • Unno - Naoyuki Kanno
  • Ono - Junko Otsuki
  • Tetsugoro Iwayama - Masahiro Takashina
  • Tetsuji Iwayama - Hitoshi Takahashi
  • Emi Iwayama - Mayumi Watanabe
  • Rumi Sahara - Kaho Shimada
  • Captain Gomez - Akihiko Hirata
  • Black Tiger - Rinichi Yamamoto
  • Chief Kid - Akira Yamaguchi [Note 11]
  • Professor Hastler - Ulf Otsuki
  • Pink Jaguar - Rushia Santo
  • Blue Jaguar - Mio Ota


  • This is Shotaro Ishinoimori's only work involving the Japanese Super Robot genre.
  • This series is seen as an homage to the works of Mitsuteru Yokoyama, creator of Giant Robo and Tetsujin-28 and the father of the Mecha/Super Robot genre.
  • The number 17 means One Seven not Seventeen as the numbers 1 and 7 are meant to be read seperately instead of together.

M One Seven concept sketch.

  • In the 75th anniversary Shotaro Ishinomori Art Book, a concept sketch of the robot shows that is was originally called M-17 (M for Megalo).
  • Originally, it was planned that Daitetsujin 17 be theatrically reprised alongside J.A.K.Q. DengekitaiIcon-crosswiki.png, the contemporary show created by Shotaro Ishinomori, it what was to be called Daitetsujin 17 vs. J.A.K.Q. Dengekitai (大鉄人17VSジャッカー電撃隊, Daitetsujin Wan-Sebun tai Jakkā Dengekitai) featuring One Seven and the Red Mufflers teaming up with J.A.K.Q.Icon-crosswiki.png. Ultimately, however, it was deemed appropriate to unite J.A.K.Q. with their Sentai predecessors in J.A.K.Q. Dengekitai vs. GorengerIcon-crosswiki.png.[1]



  1. Japanese Wikipedia
Icon-toei.png TOEI UNIVERSE
The Heroes
Super SentaiIcon-crosswiki.png - Kamen RidersIcon-crosswiki.png - Space SheriffsIcon-crosswiki.png - Kikaider - Kikaider 01 - Inazuman - Zubat
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ToQger vs. Gaim: Ressha Sentai ToQger Vs. Kamen Rider Gaim Spring Vacation Combining Special
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Crossovers in Other Media
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