High Quality Content by WIKIPEDIA articles! Alexander "Alex" Mahone is a fictional character portrayed by William Fichtner in the American television series Prison Break. The series revolves around two brothers: one who has been sentenced to death for a crime he did not commit and his younger sibling, a genius who devises an elaborate plan to help him escape prison. Mahone is introduced in the premiere of the second season as a special agent in the Federal Bureau of Investigation, specializing in manhunts for escaped prisoners for 14 years.