Penhall was a member of the SG-2 Marine unit, who participated in the liberation of the Jaffa penal colony on Erebus. Colonel Jack O'Neill switched his standard FN P90 Personal Defense Weapon with Penhall's HK SL8 sniper rifle which he used to eliminate the Jaffa in the camp. He is a proficient marksman, and was used to lay down cover fire for the rebel Jaffa with O'Neill's P90. (SG1: "Orpheus")

When Dr. Daniel Jackson, Teal'c, and Chaka went to negotiate with the Unas on P3X-403, Colonel Martin Edwards sent him and Hanson to back them up. (SG1: "Enemy Mine")

Behind the scenesEdit

  • The name Penhall may be a reference to Peter DeLuise's work on 21 Jump Street, where he played a character named Doug Penhall.

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