Abu Amin Mussa, better known by his alias Karrar Bashir al-Abbani (played by Saïd Taghmaoui) is a Muslim terrorist who Farik has replace Darwyn as the new leader of the second Los Angeles sleeper cell. His alias hinted he hails from Sudan (Serxner was also killed there) though it wasn't confirmed. When the cell's attack starts, Darwyn reveals that he's a member of the FBI and tells Karrar to surrender.