Elmer Fudd (Arthur Q. Bryan) gives it a go as a scientist, attempting to develop a potion a la Dr. Jekyll & Mr. Hyde. Unfortunately, Elmer can't seem to make it work, until Bugs Bunny (Mel Blanc) happens along. Chaos ensues in "Hare Remover", directed by an uncredited Frank Tashlin.
The copyright date is 1945, but it was not released to theatres until March 1946.
Bugs would actually meet someone more akin to Dr. Jekyll a few years later in "Hyde & Hare".