Mighty Morphin Power Rangers: Day of the Dumpster

Two astronauts are exploring the moon and happen to come across a space dumpster. When they open it, witch Rita Repulsa and her minions Goldar, Squatt, Baboo, and Finster emerge from a 10,000-year captivity. Rita decides the time has come to conquer Earth and rebuilds her palace on the moon, from which she can launch her attacks. 
In the city of Angel Grove, California, Jason Lee Scott, Zack Taylor, Billy Cranston, Trini Kwan, and Kimberly Hart are hanging out at Ernie’s Youth Center. The guys are working on karate, while the girls are practicing gymnastics. Farkus Bulkmeier and Eugene Skullovitch, better known as Bulk and Skull, come to harass them but make fools of themselves. 
The five teens are later sitting down to some fruit shakes from Ernie’s Juice Bar when an earthquake begins. At that moment, in the Command Center, Zordon, the wise sage who battled Rita many millennia ago, tells his robotic assistant, Alpha 5, to bring him five "overbearing and overemotional humans" (a.k.a. teenagers) to fight Rita. 
The five teens are then teleported from the Juice Bar to the Command Center, where Zordon explains the situation and declares them as the first Power Rangers, each with a powerful Zord. Jason, dubbed leader of the team, becomes the Red Ranger, with the power of the Tyrannosaurus; Zack is made the Black Ranger, with the Mastodon; Billy becomes the Blue Ranger, with the Triceratops; Trini is made the Yellow Ranger, with the Saber-Toothed Tiger; and Kimberly becomes the Pink Ranger, with the Pterodactyl. 
The teens don’t buy into it at first and leave the Command Center. At that moment, Rita sends a squad of her new Putty Patrollers to attack them. At first the Putties succeed, but the teens morph into the Power Rangers and beat the Putties. Then they are sent back to Angel Grove to fight more Putties, along with Rita’s most powerful warrior, Goldar. 
The Rangers maintain the upper hand until Rita throws her magic scepter to Earth to make Goldar giant. In response to this, the Rangers summon the Dinozords and combine them into the Megazord for the first time. Goldar has the upper hand on them at first, until Jason calls on the Power Sword. Afraid of being destroyed, Goldar retreats to the safety of Rita’s palace, where the angry sorceress harshly reprimands him. 
Back at the Command Center, the teens are finally convinced that they can save the world from Rita’s evil, and they agree to the following rules: (1) “Never use your power for personal gain”; (2) “Never escalate a battle unless Rita forces you to do so”; (3) “Keep your identity secret.” Zordon promises that he will be there to advise them whenever they need it, and thus the first team of Power Rangers comes together to save the world.