Threshold Threshold - Heaney and Briggs argue over "the game." Threshold - Actor Allie McCulloch on location. Threshold - Director William Stetz discusses dream sequences with actor David Purdham (Briggs). Threshold - Briggs sends Heaney on his way. Threshold - Script supervisor Teresa Randi and writer Peter Crombie Threshold - Crew and cast on location at Dockweiler Beach Threshold - Brigg's dream. Threshold - Actor Allie McCulloch as Sarah in Briggs' dream.