I'm going to give you a bit of advice. I apologize if this sounds harsh.
Never, ever, send unsolicited story ideas to an entertainment company. The company will not use them. Using unsolicited ideas from fans opens companies up to a nightmare of possible litigation. Nobody at Saban will even want to look at your idea for fear of a potential lawsuit. Your audition email is probably going to get thrown in the trash unread.
If you want to explore your ideas for a Power Rangers season, then write a fanfic. Better yet, turn your ideas into an original concept that you could trademark and copyright yourself. Don't send them to Saban, though.