逆銀河系にあるパルタ星は爆発四散する運命にあることが判り、パルタ皇帝は地球を武力で征服して移住しようとし、まずスパイとして科学者のポルトを送り込んだ。彼は地球人に正体を知られ、追われて負傷するが、敵味方の区別無く助けてくれた地球人すみ子の優しさに触れ、パルタ星を裏切った。そのためすみ子と共にパルタ星に連行されて監禁されるが、その前に彼は、地球防衛のために密かに6体のロボットを作り、すみ子との間に生まれた男の子をロボットたちに託していた。男の子はロボットたちに、中でもすみ子の優しさを体現させた看護婦ロボットのリリに大切に育てられ、正義感の強さと優しさを併せ持つ少年に成長する。そしてパルタ星のXデーが2年後に迫った12歳の時、己の使命を知った少年は6体のロボットを率いてパルタ星の侵略から地球を守るために戦う。この少年がロビンであり、彼と6体のロボットがレインボー戦隊である。 <br /><br />(For Non-Japanese Viewers) <br />When you watch the video, please click the Gear icon "⚙ "in the top-right corner of the screen to access the subtitle options, then select your language if available. <br /><br />It was discovered that the planet Partha in the reverse galaxy was destined to explode and disintegrate. The Emperor of Partha sought to conquer Earth by force and relocate his people there, first sending the scientist Port as a spy. His true identity was discovered by Earthlings, and while being pursued, he was wounded. However, touched by the kindness of Sumiko, an Earthling who helped him regardless of enemy or ally, he betrayed Partha. Consequently, he was taken to Partha with Sumiko and imprisoned. Before that, though, he had secretly built six robots for Earth's defense and entrusted the boy born to him and Sumiko to them. The boy was raised with care by the robots, especially Lili, a nurse robot embodying Sumiko's kindness. He grew into a boy possessing both a strong sense of justice and kindness. Then, at age 12, with X-Day on Partha approaching in two years, the boy learned his mission. He led the six robots into battle to protect Earth from Partha's invasion. This boy is Robin, and he and the six robots are the Rainbow Sentai.
