A bowling ball falls on Fred's head and Barney takes him to a doctor. However, this Dr. Frankenstone has a machine that can switch personalities and he's looking for a human guinea pig.
Bowling in alley 13, Fred is beaned by a bowling ball and suffers amnesia. But the doctor to whom Barney takes his friend is no ordinary family physician. He's conducting experiments in the switching of personalities, and Fred strikes him as the ideal test subject.—Morganalee