While Fievel is embarrassed he has to play a mushroom in the Green River school play Legend of Mouse Hollow, Chula has constructed a parceling machine for the mail-order business Cat R.Waul hopes to make a fortune with, if they can trick mice to pack and send to hungry felines nation-wide. Therefore Cat pretends to be a theater impresario, when that fails to lure anyone from the school cast he stages a 'real' headless monster attack to catch teacher Ironside first. Fievel and Tiger accidentally find out, free Ironside and plan to turn the tables...
—KGF Vissers