Let's pretend! Okay, now on one hand, pretend May Shelley's Frankenstein novel was real, and Victor Frankenstein was a count (like Dracula), and he didn't burn himself to death in the North Pole, but he had children with... someone (Elizabeth Lavenza being dead, but maybe pretend she wasn't) and grandchildren, Maria and Rudolph Frankenstein, who fled to the American West to use her grandfather's artificial brains (oh yes, pretend Victor did brain transplanting as well outside of the movies) on people... got that? Now, on the other hand, pretend Jessie James was an honorable Robin Hood-type robber (which he wasn't, but pretend he was) who wouldn't hurt civilians (which he did, but pretend he didn't) and is single (which he wasn't, but pretend he was) AND his friend Hank (who wasn't real, but pretend he was) gets shot in a failed heist, and then pretend the Wild Bunch wasn't founded ten years after Jessie James was killed and they get shot as well (for the most part). Now rub your hands together and you get this movie!
it's cheesy yet somehow... not terrible. My favourite part is Maria Frankenstein's Star Trek-esque laboratory machinery that looks ludicrous in a 19th Century setting, as well as how the actors involved are really giving it their all.
Incidentally, it was shot back-to-back with "Billy the Kid vs. Dracula", so maybe that explains Victor Frankenstein being a count.