Young girl who visited Samantha Carter during her time trapped aboard the deadlocked Earth vessel Prometheus. Though it is still unclear exactly who or what Grace was, Carter's mind deduced the possibility that the girl was the personification of the possibly intelligent presence of the space-born gas cloud that had trapped the ship on an interstellar "sand bar" of sorts.
Grace wanted to play with Carter, who was light-headed for the four days she was present in the cloud, after sustaining a head injury in the ship's crystal control room. Most of the time the girl was closed-minded to Carter's banter, but Samantha eventually discovered the solution to her problem through Grace's playful bubble-blowing.
Grace - A mysterious child appears to the Carter in a dream-like state after her head has been injured following an assault on Prometheus by an alien starship.