 When Samantha finally manages to start a device made by Merlin, it unfortunately renders her and colonel Mitchell invisible by transporting them to a parallel dimension. They must wait to be able even to manifest themselves till doctors Jackson and Bill Lee figure things out from the display the device presents in the language of the Ancients. Meanwhile Teal c and SG-12 travel to the planet where a whole Sodan village is exterminated by its own hero Volnek, who was turned evil by a prior as a punishment for their  disrespect  to the Ori - and find he sabotaged the portal (Eye of the gods) they need to get back.