The first episode on the disc, "Red Ranger Unplugged," Mack, having just learned that he is actually an android, begins to have an identity crisis. While he was able to get through the initial shock in order to help his team in battle, he doesn't know how this revelation will change his non-Ranger life.
This is followed by the two-parter, "Home and Away." In these episodes, Mig and Benglo use the Octavian Chalice to release Agrios, who is stronger than all of the existing Zords. Unfortunately, when Tyzonn gets knocked unconscious, he wakes up to find that he is not only back on his home planet, but apparently he never left. Eventually, Tyzonn sees through the ruse and has to rejoin the group if they are going to defeat the Fearcats' Agrios.
The next episode, "Way Back When," is a clip episode that uses Mack's internal memory to replay the events of the season. The Rangers use this episode to go over who is searching for the Corona Aurora jewels, and who has which one. This episode is a good lead up to the final three for the season, and the Rangers feel they might just know where the next gem is.
In "Two Fallen Foes", the Rangers use the Octavian Chalice to go to Greece in hopes of getting the next jewel through an ancient ritual. Unfortunately, Kamdor and Miratrix break up the ceremony. Now, the Rangers will have to face off against these two enemies once and for all.
The last episodes for this season, "Nothing to Lose" and "Crown and Punishment" have the Rangers searching for the final jewel, only to find it is a lot closer than they thought. Meanwhile, Moltor and Flurious finally confront each other, but this all ends with Flurious getting a hold of the fully powered Corona Aurora and freezing all of San Angeles. Eventually, one of the Rangers will have to sacrifice himself in order to save everybody and protect the Corona Aurora for all time.
Power Rangers is a very unique series in that every season is a new cast and new theme (well... typically a new theme), but the formula and series doesn't change. At first I was very critical of this idea (at least, when the format changed to be like this I was), and that's about when I stopped watching it, but the format obviously works for them. Maybe it is because of the short attention span of the show's target audience or the fact that the same audience can jump into the series at pretty much any point without having to know the series' back-story in order to enjoy it, but like most of the show, this season wraps up completely and leaves no loose ends so that the next season can start fresh, with yet another cast and theme.