The New Scooby-Doo Mysteries Episode 20 E.I.E.I.O Episode Title:E.I.E.I.O.Episode Description:While the gang goes on mysteries on a countryside at Old MacDonald’s E.I.E.I.O. (Experimental Institute for Evolutionary Improvement of Organisms). A genetic experiment on a field mouse making it a thirty-foot tall monster mouse and terrorize his farm.