T::H::E:: ::S::T::O::R::Y::

Sailor Moon is about a 14 year old girl named Usagi who was just a normal, klutzy girl until one day, she meet a talking cat named Luna who gives her a brooch. Saying the magic transformation phrase (which varies each season) she becomes the defender of justice, Sailor Moon.  After awhile Sailor Moon meets new allies (also Sailor Senshi) and new enemies.  Below is a smal description of each season.
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The first season is just titled Sailor Moon (how creative;-) which contains episodes 1- 46.  In this series Sailor Moon and the inner senshi are presented (Mercury, Mars, Jupiter, Venus).  Also, the rainbow crystals are brought together which forms the crystal and reveals that Sailor Moon is the princess.  The enemy in this series is Queen Beryl and the negeverse generals.
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  The second season is Sailor Moon R (stands for Returns and Romance) which contains episodes 47- 88. This series is split in two parts.  In the first part, the inner senshi are fighting against two aliens (Ann and Ail) who are searching for energy for "their tree".  Of course, Sailor Moon kicks butt.  In the second half, the evil Wiseman and his gang (Twisted Sisters, Ruebus, Esmerld, Safire, and Prince Diamond) come to the past to find Chibi-Usa and the crystal.  Sailor pluto is first introduced in this season as Luna-P or Puu.
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Sailormoon Super is the third season and contains episodes 90 - 127.  Has the apperence of the outer scouts ( Sailor Uranus, Sailor Neptune and later Sailor Saturn) and also Chibi-Usa returns from the future and becomes Sailorchibi-Moon. The villains are Professeur Tomoe, the Witches 5, and Mistres 9. They are looking for the tailsimans to bring for the Dark Meshiah to destroy the world.  Lucky for the senshi, Sailor Saturn uses her Death Reborn Revolution which makes her become a baby again. 
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The fourth season is Sailormoon SuperS (episodes 128 - 166). This season is based heavly on Chibi-Usa. It's about Pegsus and the dream mirrors. The Pegusus is trying to escape from the Dead Moon Circus and trying to save the Golden Crystal that Mamoru has.
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The last season is Sailormoon SailorStars (episodes 167 - 200). The first part was about the revenge of Queen Nehernia. The second part is when the three Sailorstars first appear (Fighter, Maker, Healer). Also a strange and yet mysterious kid named Chibi-Chibi appears just like Chibi-usa did from Sailor Moon R. The main villain is Sailor Galaxia (and the animamates who sre all sailor senshi) who is stealing all of the galaxy's star seeds.