Gina, a doctor working with/for Lex Luthor (click on thumbnails for larger versions)

Bizarro (ep7.1: aired September 27, 2007)
   

Action (ep7.5: aired October 25, 2007)
 

Hero (ep7.13 aired March 13, 2008)
  

Traveler (ep7.14 aired March 20, 2008)

Veritas (ep7.15 aired March 27, 2008)

Descent (ep7.16 aired April 17, 2008)
                

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Screen captures from http://www.smallvillededication.com/