“Radioflash” is selling itself as a survival thriller, which is half right. In truth, this “Deliverance”-style clash between Reese ( Brighton Sharbino ), a savvy teenager, and a passel of backwoods archetypes is only marginally more thrilling than the average wine tasting.

At fault is a threadbare, irritatingly vague script (by the director and artist Ben McPherson) that simply strings together a series of generic setups and forgettable characters. A promising opening establishes Reese’s problem-solving smarts as she battles through a challenging virtual-reality survival game. Later, when an unexplained event knocks out all power and communications, we expect to see her apply those skills to real-life dangers. Instead, she spends most of the movie locked in a cellar, fleeing unwashed strangers or trussed in a bag as bear bait.