Mercy Watson is a lovable, butter-loving pig who lives with her doting owners, Mr. and Mrs. Watson. One night, Mercy gets scared and hops into bed with them, causing the floor to crack! The Watsons find themselves stuck in a hole, and Mercy trots off in search of help—or more accurately, in search of her favorite treat: buttered toast. Her quest leads her on a hilarious neighborhood adventure, waking up neighbors and causing a delightful commotion, all while thinking she's on a delicious mission.