An explosion. Flames. Poisonous gas seeping into the air. This potential scenario haunts the people who live along the Clearwater River near Rocky Mountain House, Alberta. Farmers and landowners all share concerns about the risks of a proposed sour gas well in their community. While the chance of an accident is small, it's a gamble they don't want to take. Worst Case Scenario takes viewers into the town halls, boardrooms and homes where a complex debate is unfolding. Residents opposed to the well fear the impact a deadly hydrogen sulphide leak could have on their lives. Shell Canada says it must drill to meet energy needs, and points to a track record of safety. When mediation talks break down, both sides anxiously await a ruling from Alberta's Energy and Utilities Board. Capturing persuasive arguments from all sides, this spirited documentary reveals a growing conflict. On one hand, the citizens who fear for public safety - on the other, a prosperous industry that has long contributed to the economic well-being of Albertans.