Cold Lazarus
On the planet P3X562, the SG-1 team finds a valley of broken crystals.
O'Neill is Alone, and finds a whole crystal with a blue light in it.
He Touches the crystal and a duplicate of O'Neill appears.The double
returns home, with SG-1. Once back, the double seeks out O'Neill's
estranged wife, Sara.
Now revived, O'Neill returns, and realizes he has a replica. Carter and
Daniel discover the crystals contain'beings of energy' and can read
minds. The beings tell of their encounter with the Goa'ulds. They also
cannot survive on Earth.
The real O'Neill and the SG-1 team find Sara and the double, He explains
that he was trying to heal the greatest pain Jack has, the grief from
the loss of his son. In a final gesture,he takes the form of Charlie,
giving Jack and Sara a chance to say goodbye to their son.