Penhall was a member of the SG-2 Marine unit.
He 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")
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. And Penhall is always mentioned in connection to Hanson, which was Johnny Depp's character on 21 Jump Street.