As the summary says, a string of robberies have been occuring, and, mysteriously, no clues have been found, other than a rat hole in the buildings and rat footprints. The next night, Krypto and Ace decide to follow the rats after their stealing spree, and find that Isis is under control of them with her new stolen pipe. She then uses it to hypnotize Krypto and Ace, while before she can use them for her work, Jimmy steals the pipe, and tries to control Isis. Inevitably, he can't find the song, but manages to take control of other animals nearby at a farm show and distract her long enough for Krypto and Ace to break free. And that marks the end of Isis.
Well...OK, not really meant to be taken seriously, and it could deserve a higher score, but I felt that it was mostly for comedy, and not seriousness. I did, however, laugh, and I enjoyed watching this episode for all that it was worth. 9.6/10