William Fichtner is an American actor. He is known for his television roles as Sheriff Tom Underlay on Invasion, Alexander Mahone on Prison Break, Carl Hickman on Crossing Lines, and Adam Janikowski on Mom. A prolific character actor in film, Fichtner is recognized for memorable performances in Heat, Contact, Armageddon, The Perfect Storm, Go, Crash, Black Hawk Down, Teenage Mutant Ninja Turtles and The Dark Knight.