In an alternate reality, Jack O'Neill had been married to Samantha Carter for a year. He also died in the Goa'uld invasion of Earth. His death had a huge emotional impact on his wife.
It seems he is very similar to his counterpart on our reality. It appears that he also frequently used the phrase "for crying outloud" and wouldn't "have a clue" what to tell a woman in the middle of an emotional crisis.
Biography[]
In the SGC infirmary, Doctor Samantha Carter is confused when she sees Colonel Jack O'Neill, who is confused as well when he sees that Major Carter has changed (the hair). Dr. Carter states that she never expected that his "Jack" would be alive in this variation.
Later, when O'Neill tells Dr. Carter that her and the alternate Major Kawalsky can stay at Stargate Command, Dr. Carter starts crying and tells her Jack's story to O'Neill. O'Neill is getting confused. Yet, he understand her husband's loss and hugs her to comfort her.
After the Asgard have delivered the alternate Earth from the Goa'uld, it's time for farewell. Major Kawalsky says it was an honor to serve with O'Neill... again. Dr. Carter seems sad as this is her second goodbyes. According to her, her Jack had "the same face, same voice... same hands." Then O'Neill asks her why she could marry such a looser. She laughs and they stare each other for a moment, then Dr. Carter kisses him. She realises that O'Neill is really not her "Jack". (SG1: "Point of View")