Stargate: Atlantis will begin its fifth season this year, but there are quite a few changes in the roster from season four. Among the additions and deletions are:
- Jewel Staite now has a regular cast role, instead of a recurring role.
- Amanda Tapping is leaving the series to work on the new series Sanctuary.
- Robert Picardo is reprising his role as Richard Woolsey to join the regular cast.
- Paul McGillion will appear in four or five episodes in season five.
- Tori Higginson will not appear in any episodes this season.
Source: Slice of SciFi