[MattEmily]

You do have a point there since we have an evil alien (Lothor) who returns to take over the world for revenge.
You have someone that is somehow trapped - in Zordon's case it was a time warp and in Sensei's case it was in a guinea pig form.
You have a technical advisor, one was a robot, one was a human.
You have teenagers that become Rangers.
You have evil Rangers.