The series takes place in the fictional town of Angel Grove, California. On an exploratory mission, two astronauts discover an extraterrestrial container (referred to as a dumpster as a result of its smell) and breach the unit, inadvertently releasing the evil alien sorceress Rita Repulsa from 10,000 years of confinement. Upon her release, she and her army of evil space aliens set their sights on conquering the nearest planet—Earth. The wise sage Zordon, who was responsible for capturing Rita (and also being enemies on Zordon's home world, Eltar), later becomes aware of her release and orders his robotic assistant Alpha 5 to select five "teenagers with attitude" to defend the Earth from Rita's attacks. The five teens chosen are Jason Lee Scott, Kimberly Hart, Zack Taylor, Trini Kwan, and Billy Cranston. Zordon gives them the ability to transform into a superhuman fighting force known as the Power Rangers. This provides them with formidable abilities and an arsenal of weapons, as well as colossal assault vehicles called Zords which can combine into a giant humanoid machine known as the Megazord.
