When Pieface rescues Walter and Bertie from danger, Dennis leads the town in celebrating Pieface Day in his honour, and refuses to listen when Pieface tries to tell him it was all a big mistake. Walter uncovers the truth, proclaims himself the bigger hero, and declares it Walter Week!

When Crusty the robot pie spy is forced by Doctor Pfooflepfeffer to send her photos of Professor Screwtop's latest inventions, the gang get their own back by tricking Crusty into sending her the silliest inventions they can think of.