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Major Kathleen Sparr was an officer of the United States Army and an aide to General Thaddeus Ross. She assisted him in the pursuit of Bruce Banner following the latter's transformation into the Hulk.
Sparr was among the US Army Officers in charge of the Bio-Tech Force Enhancement Project. Following the incident with Dr. Bruce Banner that transformed him into the Hulk, Sparr accompanied General Thaddeus Ross in his hunt for Dr. Banner. When Banner's blood contaiminated a soda that was drank by a man in Milwaukee, she informed Ross in his office at the Pentagon.
She traveled with the Strategic Operations Command Center to Brazil and coordinated the ambush from the command truck. After the attack failed and Banner traveled to Culver University, she again commanded the battle from the command truck.
She used the S.H.I.E.L.D. computers to track Banner's communications to Samuel Sterns at Grayburn College. When her unit apprehended Banner in Sterns' lab, she interrogated Sterns, but was killed when Emil Blonsky snapped her neck with blunt force.
- United States Armed Forces
- In the comics, Katherine Spar is a scientist hired by Thaddeus Ross as a member of the Hulkbusters to help him track both Hulk and Abomination.