William Edward 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, The Longest Yard, Teenage Mutant Ninja Turtles and The Dark Knight.

Invasion is an American science fiction television series created by Shaun Cassidy. It originally aired on ABC from September 21, 2005 through May 17, 2006. Somewhat similar to Invasion of the Body Snatchers, the show told the story of the aftermath of a hurricane in which water-based creatures infiltrate a small Florida town and begin to take over the bodies of the town's inhabitants through a cloning process. It stars an ensemble cast featuring William Fichtner, Eddie Cibrian, Kari Matchett, Lisa Sheridan, Tyler Labine, Alexis Dziena, Evan Peters and Ariel Gade. The show was produced by Shaun Cassidy Productions and Warner Bros. Television.