Helen Sharpe was a female Tau'ri and she is stationed on the ship Apollo and its second in command. In 2008, she was on board when Apollo did a study of New Lantea and its star system. She was on the bridge when the unknown force damaged the ship.

She gave orders to Radek Zelenka to investigate what caused the damage. She was in Pegasus galaxy, a one last time before she would continue his service to Earth. She has children on Earth that she miss. (SGA: "Zero Point")

She is a Captain in the United States Air Force stationed at Homeworld Command. (SGU: "Air")