Sentinal; Taken from scifiguide.net New details on the late Season Five episode "Sentinel" are available. Tobias and Grieves -- members of the NID's rogue Stargate team arrested in "Shades of Grey," -- will appear in this episode. SG-1 discovers that the rogue team broke a complex machine that guarded a world from the Goa'uld (I'm thinking along the lines of Thor's Hammer), leaving it open to attack. The team arrives on the planet to find that it is under attack by forces of the Goa'uld Anubis. O'Neill is forced to get Tobias and Grieves out of imprisonment at Levenworth, because they promise him that they can fix the device, and take them back to the planet. Sounds good!