*A 15 year old boy arrives at the SGC, claiming to be Jack O'Neill. He has O'Neill's security ID, his knowledge, his attitude, and his DNA is a statistical match. Adding to the puzzle, the colonel is missing. As SG-1 attempts to unravel the mystery, young O'Neill begins to have flashes of memory of an abduction by the Asgard. Daniel and Teal'c pursue the investigation by interviewing other people who have reported similar experiences of alien abduction and memory loss. Meanwhile, Dr. Fraiser has disturbing news. Her analysis of young O'Neill's DNA reveals that his genetic structure is breaking down. He is dying. *Source: Back of card