E*I*E*I*O

E*I*E*I*O is the second half of the twelfth episode of The New Scooby-Doo Mysteries.

Premise
The kids head over to the Experimental Institute for Evolutionary Improvement of Organism, also know as EIEIO, to help old Mr. McDonald, the director, discover who is creating monsters with the secret formula that he developed to create large amounts of food.

Cast and Characters

 * Don Messick as Scooby-Doo and Scrappy-Doo
 * Casey Kasem as Shaggy Rogers
 * Heather North as Daphne Blake
 * as Mr. McDonald
 * as Parker
 * as Monster Mouse

Villains

 * Monster Mouse

Culprits

 * Parker (farm worker commanding a real genetically-engineered giant mouse).

Locations

 * EIEIO