Justin Timberlake) and pliable women (Olivia Wilde). When strung-out acquaintance Jake (Ben Foster) welshes on a debt, Johnny impulsively snatches Jake’s younger stepbrother Zack (Anton Yelchin) to force his hand.

Cassavetes has attracted a notable ensemble cast and, in encouraging the enthusiastically unhinged performances of his often shirtless, tattooed actors, he does a good job of capturing the charged, hormonal aggressiveness of youth. The result is stylish, adrenaline-charged and quite insistent, qualities that initially serve it well in holding one’s attention. Still, the movie unfolds at only one pitch, and the heightened tone eventually reveals itself as more of a default position than a clever gambit. There’s no particular depth to the “pack of wolves” metaphor, no cautionary lessons to be gleaned — just broad, colorful strokes and a sugar rush of sweaty, nicely photographed delinquency. (Universal, R, 122 minutes)