There was no shortage of memorable villains in Breaking Bad, from volatile, sociopathic kingpin Tuco Salamanca to calm sociopathic kingpin Gus Fring—not to mention the show's protagonist, Walter White, whose gradual descent from antihero to villain was the core of the show. But of all the bad guys Walt and Jesse encountered on their meth-cooking adventures, nobody embodied pure, dead-eyed evil more memorably than Jesse Plemmons' Todd Alquist.