Outsiders is a short story which was published by Titan Magazines in Stargate SG-1/Atlantis: The Official Magazine 20.
Stranded on an alien planet, wounded and separated from SG-1, Lt. Colonel Cameron Mitchell finds himself trapped in a cave, fighting off a horde of Vala Mal Dorans...
The events depicted in this adventure are set sometime early on in Season 10 of Stargate SG-1, possibly before Morpheus.
An official extract: