Scooby-Doo and Scrappy-Doo

E*I*E*I*O (6x24)

Air date: Nov 24, 1984

While the gang goes on mysteries on a countryside at Old MacDonald’s E.I.E.I.O. (short for 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.