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.
as Stevie
as Professor Hassler
as Dr. Sahara
as Judy Sahara
as Captain Bob Kendall, "The Razor"
as Captain Roper
as Chief Kidd
as Pink Jaguar
as Blue Jaguar
as Defenders Captain
as Carrie Sahara
as Fred, Stevie's friend
as Prisoner
