Hi Wingless Flier!
Season 5 is year 5 in the USA. It has been on five years and next year will be on for the Sixth year which will be its last. The producers want to do SG-1 movies after that.. and their should be a spinoff.... tentatively with Atlantis somewhere in the title. I watch on the American Continent so our dates and times are different than yours... but some of the British members will be along soon and can give you more information... Also you can check out Darren's site for more information....Will get the addy for you! http://www.scifiguide.net/stargate/
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