Territorial Film Developments (TFD)

Based on true events, Grace, her boyfriend Adam, and her younger sister, Lee, are on holiday in Northern Australia when they decide to take a tour down a river. As they drift into a swamp, their boat suddenly capsizes. Stranded in the flooded swamp, the three tourists must figure out what to do to survive as they realize they are being watched through the black water.

A mysterious Green Knight rides into a court celebration and challenges the young knights present to strike him with his own axe - on the condition that he, the Green Knight, may return exactly the same blow in a year and a day. Gawain accepts and cuts off his head. But the Green Knight stands up, retrieves his head, and rides away, reminding Gawain of his promise.