“Grace” is episode thirteen of season seven of Stargate SG-1.
The X-303, Prometheus, which was left stranded in deep space far from Earth with no hyperdrive in “Memento”, is making its way home using a hyperdrive lifted from an Al’kesh. As that hyperdrive wasn’t designed for a ship of the X-303’s size, the journey is being done in stages. Carter wants them to stop at a nebula along the way. At one of the scheduled stops, the ship is approached by an unknown vessel, and they can’t jump away. Then it opens fire, and Sam suggests hiding inside the gas cloud.
Whilst trying to fix the engines, Sam is knocked unconscious and comes to on an empty ship with no escape pods. The ship is stuck inside the nebula, and whilst trying to fix it, she starts seeing a little girl, As she’s also having conversations with people she knows are not there, is the girl real or not?