Granddaughter of George Hammond and older sister to Kayla. Following a day at school Tessa and Kayla were briefly kidnapped by a rogue arm of the N.I.D. who hoped to send a message to General Hammond about the insecurity of his family in hopes that he would resign. They were taken for a brief ride in a car and then dropped off at home. This ploy worked, and Hammond temporarily resigned, until Robert Kinsey was convinced (at gunpoint by Jack O'Neill) to drop the matter. PLAYED BY - FIRST APPEARED - Chain Reaction
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