A treasure hunt turns to mystery when Izzy and Timmy go to dig up treasure at the top of Lawrence Pinecone's Statue's shadow and find nothing there! The Mechas need to help Berta find the pinecone to save the treasure hunt./The mysterious "Pretty Big Thing" is scaring people from going to work, so it's up to the Mechas to find out what it is. However, the situation takes a turn when they discover that the Pretty Big Thing is actually only its shadow.