This television series was ground breaking for it's time. When it aired on Channel Four in the UK many years ago it was a very popular show by all the activity on Channel Four Forums. In this final sixth season everything is turned on it's head as many of the characters collide in a monumental climactic ending to the best television series ever. If you are a fan and have enjoyed the previous series collections, add this one to your dvd shelf. If you have never seen this show before, don't spoil it by buying this series first, get all the others before hand and watch them first.
Oh and by the way a region two coded set of HBO's OZ is on it's way so you can always wait for that if you don't have multi-region capabilities.