Dewight has a problem shut away deep in his mind. Old Man Kavenaugh has a problem locked away in his decrepit shed behind his rural home. When Dewight's car breaks down on a lonely road near Kavenaugh's abode, the two have a chance encounter that spirals into an ever increasing bizarre, horrific, and nightmarish journey.

Roar follows a family who are attacked by various African animals at the secluded home of their keeper.