Devin Cooper is an Ekaterina agent from Evanston, Illinois in the United States. He is an expert engineer who built a highly advanced tree house, which included a top-level security system, a water balloon cannon, and an underground prison. Devin was called upon by Ekaterina leadership to build booby traps to protect the Rosetta Stone at the British Museum, which hid a hint leading to the Ekaterina Clue, Silver. Devin traveled to the Ekaterina stronghold at Hotel Excelsior in Cairo, Egypt for a few weeks for this purpose.
Devin later reappears at the Cairo stronghold during Unstoppable Mission 4: Operation Homefront.