Drawing from urban legends and American folklore for its weekly ghost stories, “Supernatural,” takes the WB back to its bloodcurdling roots -- “Buffy the Vampire Slayer” and “Angel” -- and pushes the genre with visual effects and gore reminiscent of popular horror flicks, such as “The Ring” and “The Grudge.”

“We have a folklore in mythology that is as rich and developed as any world culture’s and as uniquely American as baseball,” said Eric Kripke, the creator of the show that debuts at 9 tonight. “I found that such an interesting and untapped source of stories. People have heard these stories, but they’re all part of this great mythology of America that speaks to the unique fears we have in America. They’re every bit as relevant today as when they were originally told because if there’s any one cultural zeitgeist at the moment it is that we’re living in the age of anxiety.”

In the show, two of the WB’s homegrown young stars, Jensen Ackles (“Smallville”) and Jared Padalecki (“Gilmore Girls”), play brothers Dean and Sam, who are on a strange road trip, trying to find their missing father and battling satanic forces that may seem familiar to those who know their horror mythology: the Vanishing Hitchhiker, the Hook Man, Blood Mary.

Ackles, 27, and Padalecki, 23, have grown up on the network and were handpicked as the series stars. Just don’t expect them to be their usual sensitive, sexy selves. On this show, their eyes bleed and they are chased by a half-man, half-beast through the woods, and that’s just for starters. (...) The WB, which has struggled badly the last few seasons, has high hopes for the critically lauded “Supernatural.” It’s comely stars and offbeat humor will help, but mainly the show relies on one emotion to draw viewers: fear.

“We want people to turn the lights off when the show comes on and figure out that they bit off more than they could chew and now they’re in trouble trying to go to sleep at night, staring outside the window,” said executive producer McG (“Charlie’s Angels” and “The O.C.”). “We want to make you a little uptight where you have to call a friend or play solitaire on your computer to take your mind off the things that go bump in the night.” 

The 31-year-old Kripke’s fascination with urban legends began in elementary school when he read the story of the Hook Man, which led him to one of his favorite books, “Kentucky Fried Rat and Other Gruesome Stories.” In college, Kripke examined the tales for what they said about American culture at a given time. (...) For the last eight years, Kripke dreamed of parlaying his “personal obsession” into a television series. First he envisioned it as an anthology but quickly learned that concept would not sell in Hollywood. Then he imagined reporters as his protagonists, fighting the demons in search of the truth. He shelved that one too. Then the road trip idea, with two estranged brothers in their ’67 Chevy Impala, navigating the back roads of America, clicked.

Kripke showed up for his first week of work with a list of 40 to 50 possible ghost stories and urban legends to work from.

“I landed on this idea to have this mythic road trip across the country, and it became the best vehicle to tell these stories because it’s pure, stripped down and uniquely American,” Kripke said. “These stories exist in these small towns all across the country, and it just makes so much sense to drive in and out of these stories.”

David Janollari, the WB’s president of entertainment, believes that the brothers’ road trip is the series’ most engaging element. “It allows you to feel on a week-to-week basis that the show is very real, that it could happen in your hometown or anywhere in the U.S.A.,” Janollari said.

“Supernatural” also signals a new day for the 10-year-old network that’s mostly watched by teenage girls. With protagonists who are in their 20s -- not high school -- executives hope to attract an older slice of the 18- to 34-year-old demographic as well as parents who will watch the series with their children. The shift is part of the network’s design to pick itself up out of a two-year ratings slump during which it has failed to develop a hit.

“It does represent a little bit of an aging up of the network for us, but not drastically out of our wheelhouse,” Janollari said. “In the features world, the moviegoing audience of horror films is 60% young and female, which is a natural fit for our network. The name of the game is to get attention and create buzz-worthy shows that people are talking about, and I think this show has all the bells and whistles that will make men and women alike sit back and enjoy a really scary ride.”

Sam Winchester (Padalecki) is the rational brother, the one who temporarily left the family’s crusade to pursue a law career and fall in love.

But tragedy has once again befallen Sam, and he has no choice but to hit the road with older brother Dean.

“Dean is kind of like Hans Solo, this rebel renegade guy,” Ackles said. “He’s got his own version of authority and his own version of doing things. And he’s fearless. I am really digging the relationship between the two of them and the fact that they’re dealing with something really cool and scary in their own blue-collar, rugged way.” (...)