AMC is confirming that Michael McKean is joining series star Bob Odenkirk in "Better Call Saul," the much-awaited prequel to "Breaking Bad." Best-known from the film "This Is Spinal Tap," McKean will play the brother of Saul Goodman, the wily lawyer originated by Odenkirk in the wildly popular drama "Breaking Bad." A returning supporting actor is Jonathan Banks, who played "fixer" Mike Erhmantraut.