Tonight we watched Frankenstein, released in 1931, and Bride of Frankenstein, released in 1935. They both starred Boris Karloff as The Monster and Colin Clive as Dr. Frankenstein; but Fritz, the assistant played in the earlier movie by Dwight Frye, died in that film, so the assistant in the later movie was re-named Karl but still played by Dwight Frye. Interestingly, Frye's character got killed by the Monster in the second movie, too. I liked Frye as Renfield in the Bela Lugosi Dracula. Mae Clarke played Elizabeth, Dr. Frankenstein's fiancee, in the 1st movie, but the character was played by Valerie Hobson in Bride of Frankenstein.
9/20/2007: 1001Flicks has a review of Frankenstein.