When a relentless rainstorm destroys Petrie's nest, Petrie freaks out at the prospect having to move to a new nest. Meanwhile, Cera insists that Ducky take on the seemingly impossible task of teaching baby Tricia how to swim.

When Spike accidentally falls into a deep hole, a group of tiny subterranean mammals declare him "The Big Wise One" and treat him like royalty. Unaware of this, Mr. Thicknose and Mr. Threehorn argue at length about the best way to rescue Spike, without making any effort to get him out! Meanwhile, Spike discovers that he must face the Great Hideous Beast!