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.
神谷まさひろ
as Stevie
大月ウルフ
as Professor Hassler
中丸忠雄
as Dr. Sahara
竹井みどり
as Judy Sahara
Gō Haraguchi
as Captain Bob Kendall, "The Razor"
平田昭彦
as Captain Roper
山口豪久
as Chief Kidd
Lucia Santo
as Pink Jaguar
Mio Ota
as Blue Jaguar
Kenji Tamiya
as Defenders Captain
Kaho Shimada
as Carrie Sahara
Masahiro Takashina
as Fred, Stevie's friend
