First the novella : Strange Case of Dr Jekyll and Mr Hyde
by the Scottish author Robert Louis Stevenson, 1886.
http://en.wikipedia.org/wiki/Strange_Case_of_Dr_Jekyll_and_Mr_Hyde
Then the movies (I like the 1920 version):
http://www.bing.com/videos/search?q=jekyl+and+hyde&qpvt=jekyl+and+hyde&FORM=VDRE#
Then the musicals:
http://jekyll-hyde.com/showinfo/
http://www.bing.com/videos/search?q=jekyl+and+hyde+musical&qpvt=jekyl+and+hyde+musical&FORM=VDRE#