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Like Knowle Rohrer, Shannon McMahon is the project's first supersoldier which has no weaknesses and cannot be killed. One of her non-human abilities as seen in the show is to breathe under water.
Shannon McMahon was played by Lucy Lawless.
Originally, Shannon McMahon was to be a recurring character and feature in "The Truth", the series finale of The X-Files. However, actress Lucy Lawless became pregnant shortly after the episodes "Nothing Important Happened Today" and "Nothing Important Happened Today II" were shot. She had a traumatic pregnancy but delivered a healthy son in May 2002 and ultimately did not return to the series in its final two-parter. 
|Billy Miles||Knowle Rohrer||Gene Crane||Game Warden|
|Shannon McMahon||"Shadow Man"||"Toothpick Man"|