A dangerous experiment turns a scientist into a hideous creature called the Man-Bat.

Penguin discovers a sonic device that allows him to turn Man-Bat into his personal slave. Meanwhile, Alfred must deal with a raccoon which has found its way into the Bat-Cave and is wreaking havoc on the electric equipment.

A trio of college misfits use stolen mutagens from Dr. Kirk Langstrom to transform themselves into animal forms and get revenge on those who have scorned them.