Screen Gems has released a new, five-minute clip from director Harald Zwart’s upcoming YA adaptation The Mortal Instruments: City of Bones.  Set in contemporary New York City, the film tells the story of Clary Fray (Lily Collins), a seemingly ordinary teenager who discovers that she is the descendant of a line of Shadowhunters, a secret organization of young half-angel warriors in an ancient battle to protect our world from demons.  This clip is the same one the studio showed off at Comic-Con, and it features a pretty intense fight scene between Lena Headey and Kevin Durand, as well as a really gnarly creature.

Hit the jump to watch the extended clip.  The film also stars Jamie Campbell BowerKevin ZegersJared HarrisJonathan Rhys Meyers, CCH Pounder and Aidan TurnerThe Mortal Instruments: City of Bones opens on August 21st.

Via Yahoo! Movies.

Here’s the official synopsis for The Mortal Instruments: City of Bones:

Set in contemporary New York City, a seemingly ordinary teenager, Clary Fray (Lily Collins), discovers she is the descendant of a line of Shadowhunters, a secret cadre of young half-angel warriors locked in an ancient battle to protect our world from demons. After the disappearance of her mother (Lena Headey), Clary must join forces with a group of Shadowhunters, who introduce her to a dangerous alternate New York called Downworld, filled with demons, warlocks, vampires, werewolves and other deadly creatures. Based on the worldwide best-selling book series.

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