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|Place of origin:||Earth|
|Appearance:||The Sontaran Stratagem|
|Main actor:||Rad Kaim|
Trepper was a Polish employee at an ATMOS factory. Martha Jones, while working for UNIT, examined Trepper and found out he, and the other ATMOS workers were hypnotised by the Sontarans. (TV: The Sontaran Stratagem)