There were inscriptions written above the entrance of the Temple of Apollo at the Oracle of Delphi, and the two most famous ones were cautionary words of wisdom: "Know thyself" and "Nothing too much." Those bits of ancient advice are worth considering as two Hollywood studios hope to launch film franchises that use Greek mythology as the unlikely premise for popcorn entertainment.

"These are the stories that began storytelling in many ways," director Louis Leterrier said a few months ago on the London set of his "Clash of the Titans," the Warner Bros. epic that arrives in theaters in March with Sam Worthington as Perseus, Liam Neeson as Zeus and Ralph Fiennes as Hades. "These are tales of adventure that endure. These stories are who we are."

True, which lives up to the "Know thyself" advice. But as for that second suggestion, the one calling for limits, well, Hollywood has never been known for moderation. "Clash of the Titans" arrives in theaters on the winged heels of "Percy Jackson & the Olympians: The Lightning Thief," which also has mighty Zeus (Sean Bean), the nefarious Hades (Steve Coogan) and the other gods of grand Olympus, although it brings them to modern-day Manhattan where they meet the title character, one of the most popular heroes at the bookstores in recent years with the best-selling young-reader novels of Rick Riordan. No surprise, the makers of both films are eyeing each other with some anxiety.

"You can't ignore it," said "Percy Jackson" director Chris Columbus while taking a break from postproduction work in San Francisco on the film that opens Feb. 12 and, for Fox, has been circled as a potential "Harry Potter"-style multiple-film property. "They are two completely different pictures. But I'd be a liar if I said that I'm not fascinated by everything they're doing. In today's version of Hollywood, you have to be aware of everything else that's going on around you. It's just kind of foolish to put yourself in a bubble and pretend it's not there."

It's interesting that Hollywood is once again looking back to Greece and the Roman Empire for adventure tales and, in the cases of "Clash" and "Percy," special-effects fantasies. Just as "The Lord of the Rings" and "The Chronicles of Narnia" were pulled from the bookshelf for their potential in this digital-effects era, Columbus said the thunderbolts of Zeus and the pits of Tartarus are camera-ready for the 21st century. "The world of Greek myth really hasn't been dealt with, on screen, in a long time, at least not in terms of a big blockbuster motion picture," Columbus said. "It's exciting to think about. At least it is for me."

"Percy Jackson" stars 17-year-old Logan Lerman ("3:10 to Yuma") as the title character, a troubled youngster who (like a certain boy-wizard) discovers he has a magical heritage and then teams with his young friends to fight the dark forces aligned against him. Columbus directed the first two "Potter" films and was brought in by Fox with hopes that magic lightning can strike twice.

"Clash of the Titans" is a familiar brand name to fans from the 1981 movie of the same title and, like that film, this new model is more about an adrenaline adventure than meticulous scholarship. Leterrier and his star, Worthington, have already discussed the possibilities of a sequel, and Warner Bros. has high hopes for the movie.

The films follow a surge in more traditional sword-and-sandal movies in recent years. The decade began with "Gladiator," which won the Oscar for best picture, and it was followed in 2004 by both "Alexander" and "Troy." It was the 2007 hit film "300," though, that truly captured the attention of Hollywood executives with $456 million in worldwide box office off a $67 million budget.

The Zack Snyder film, the highest-grossing March release ever, was based on Frank Miller's graphic novel about King Leonidas and his doomed army of Spartans; Miller is preparing a follow-up now titled "Xerxes," which begins about 10 years before the events of "300," and Snyder has expressed interest in it as a film property as well. "It's the battle of Marathon through my lens," Miller said Wednesday. "I've finished the plot and I'm getting started on the artwork."

Miller said he is not surprised Greece is resurgent in Hollywood. "Every generation returns to ancient Greece because, well, the stories are so damn good," said the artist, who also directed last year's "The Spirit."

And Hollywood isn't limiting its star search to the Greco-Roman gods. Marvel Studios and director Kenneth Branagh are just now getting under way with "Thor," based on the Norse god of thunder as imagined by Jack Kirby, Walt Simonson and, more recently, J. Michael Straczynski in the pages of Marvel Comics.

Are the old gods still viable to the young moviegoers who made "Transformers: Revenge of the Fallen" the highest-grossing film of 2009?

On the set of "Clash," star Worthington, still sweating from battle and picking at flecks of blood on his fingernails, dismissed the idea that ancient epics can't be of-the-moment.

"Look at this world," he said, nodding toward the set of the river Styx. "We're not exactly going by the book. The armor we wear is very futuristic-looking. It's not dated to a period of time in a history book. This is a story with winged horses ... but what we're doing, we have to have a modern take on it, to make it relevant to our audience. This isn't like a Ridley Scott kind of thing, where every minute detail has to be an exact replica. We're making a fun kind of romp."

The original "Clash" starred Harry Hamlin, Laurence Olivier and Burgess Meredith, but the most memorable performance was the stop-motion animation by effects pioneer Ray Harryhausen.

The new film, from the screenplay by Phil Hay and Matt Manfredi, follows the journey of Perseus, the son of Zeus and a human mother, as he becomes a reluctant volunteer in the building conflict between his father and Hades. The film, like the original, is an amalgam of Greek myths and, again, a centerpiece is the showdown with Medusa, the cursed creature with serpent-tresses.

This time, Medusa's lair has staircases and walls that run off in different directions, like an M.C. Escher madhouse, since she can slither up surfaces. "It's amazing," Leterrier bragged of the work by production designer Martin Laing. But will it be enough to set "Clash's" Medusa apart from the one moviegoers will have already seen in "Percy Jackson"? Columbus smiled at the question.

"We're a good, solid five weeks ahead of the release of 'Clash,' so we will have succeeded or failed at that point," Columbus said. "I'm very, very confident about our characters, our performances and our creatures. And I'm telling you, when you see Uma Thurman as our Medusa - well, you've never seen anything like it. It's pretty spectacular. It's something you've never even dreamed of."

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