Desperation will make anyone, including cats, do strange things. In the case of this Tom & Jerry short, Tom cooks up a bizarre potion bent on terminating Jerry once and for all. After all, it worked on a common housefly. However, it backfires on Tom. Oh, does it ever.
In "Dr. Jekyll & Mr. Mouse", Bill Hanna & Joe Barbera's send-up of Robert Louis Stevenson's Dr. Jekyll & Mr. Hyde, Jerry ends up in the role of Edward Hyde, much like Tweety would 13 years later in "Hyde & Go Tweet", as we saw earlier this week. Expect plenty of chaos.
Don't show this to your pet cat.