Vampires, zombies, serial killers and a host of other evildoers roam wild over the pop culture landscape. And when they come to prime time, you can be sure there will be blood.

The flesh-eating undead of AMC's "The Walking Dead" relentlessly stalk survivors. Bloodsuckers and blood lust -- among other forms of lust -- abound in HBO's "True Blood." The serial killer of serial killers, Dexter Morgan, carries out his own brutal brand of vigilante justice on Showtime's "Dexter." And creative homicidal psychopaths routinely keep the dogged investigators from "Criminal Minds," "Bones" and the "CSI" franchises on their toes.

But while splatter and gore are essential, and expected, parts of the DNA of those popular dramas, extreme, unflinching acts of graphic, stomach-churning violence have been spilling into an unexpected arena: television's elite dramas. AMC's "Breaking Bad" and HBO's "Boardwalk Empire," among other shows, have long enjoyed critical praise for interweaving complex character studies, intricate plots and high production values. But this season these quality programs have unveiled a new level of savagery.

Vivid detail

Violence in television is, of course, not new. What is new -- at least in this class of programming -- is the unsparing detail with which it's being displayed, not to mention the inventiveness employed in showcasing the hacking, dismembering and killing. For these shows, the "graphic violence" label before the opening credits isn't just an advisory, it's a warning.

The Prohibition-era mobster tale "Boardwalk Empire," which received 18 Emmy nominations this year, has featured a close-up of a man getting his head caved in by a heavy wrench and the scalping of a veteran of the American-Indian Wars.

The fourth-season opener of "Breaking Bad," whose leading man, Bryan Cranston, has won three Emmys for his gritty portrayal of a chemistry teacher-turned-meth-maker, saw drug kingpin Gustavo Fring (Giancarlo Esposito) don plastic overalls before slashing the throat of an accomplice.

Even though the A-list bloodshed occurs on premium and basic cable, where standards for violence are far looser than on the major networks, the extreme acts have provoked sharp reaction from some of the shows' most adoring critics.

Critics

Of "Boardwalk Empire's" wrench and scalping scenes, which occurred in the same episode, Matt Zoller Seitz of Salon.com called them "two spectacular acts of violence that played like textbook examples of a show trying to jack up its excitement level with 'Oh, my God, I can't believe they did that' mayhem."

He said the scenes "cheerfully confirmed the show's allegiance to the worst impulses of Martin Scorsese and 'The Sopranos' " -- the tendency to spotlight macho one-upmanship "in the most gruesome terms imaginable."

USA Today writer Scott Bowles argued that "Breaking Bad" "is pushing how much violence basic cable can get away with."

Sense of realism

The depictions of violence could actually be more graphic -- "We self-edit a lot," said Terence Winter, creator of "Boardwalk Empire."

Still, the key forces behind these shows maintain that while the violence may be disturbing and vivid, it is included to serve the story, the characters and realism -- not for shock value.

"I never intended 'Breaking Bad' to be a show for the whole family. It's certainly not for children or for every adult," said Vince Gilligan, the show's creator. "It's a show for people who are comfortable watching an unflinching representation of a very real life situation and problem: the international drug trade. There are moments we're not going to shrink from. We don't try to shock, but it is our intention to show in a very adult and realistic way the consequences of bad decisionmaking."

Gilligan added: "If one of our villains cuts a man's throat, it seems to me that the most honest way to portray that is to show how horrible that reality is, and to show it in as unflinching a manner as possible. It may be uncomfortable to watch, but to not show it that way is a disservice to real life."

Winter defends the violence on "Boardwalk Empire," which stars Steve Buscemi as political boss Nucky Thompson, as appropriate for the themes explored in a gangster drama.

"If there's an increase in violence, it's due to the circumstances on the show, where everybody is under pressure," Winter said. "In terms of how we show violence, it's meant to be disturbing and jarring."

Winter, a former writer and executive producer on HBO's landmark series "The Sopranos," compared "Boardwalk Empire" to his previous series: "There has to be a point where the audience says, 'These are horrible people. They're not sup- posed to be likable. They're killers.' "