Trepper
From Tardis Wiki, the free Doctor Who reference
Martha Jones while working in UNIT, examened this Poleish man by doing a mecical exam. While doing this exam Martha Jones realised he was not Human and ran for the Tenth Doctor but when Staal found out he ordered clone Harris (The Sontaran Stratagem) and Steve Gray to kidnap Martha Jones in a new plan. DW:The Sontaran Stratagem