Private Griffen was a S.A.S soldier who served alongside "Soap" MacTavish, Captain Price and Gaz during the events of Call of Duty 4: Modern Warfare. Griffen participated in the raiding of the cargo ship on "Crew Expendable". Fighting alongside the full squad for the first few minutes of the mission, he was then assigned by Captain Price to guard the rear of the unit with Wallcroft while the rest of the unit breached the cargo hold. He and Wallcroft boarded the helicopter, before they spotted some incoming MiGs which subsequently opened fire on the ship. He survived the events of "Crew Expendable".