Here's a quick formula for a successful movie. Step one: Take a historical figure or a fictional character whose creator died long enough ago for their work to be in the public domain. Step two: Add a randomly selected creature or monster from the urban fantasy shelf in the nearest bookstore. Step three: Make a movie in which these two things either team up or fight each other to the death. Congratulations! You have just printed yourself a lot of money.
It's almost impossible to make a movie with this premise sound unappealing. Abraham Lincoln vs. Cats. Sherlock Holmes vs. Cthulhu. King Arthur and the Knights of the Round Table vs. a Really Big Bear. Achilles vs. MechaHector. Who among us would not pay to see all of these films?
Like you've never wanted to see Betsy Ross fight werewolves with that sewing needle.
Why It Doesn't Work:
We all want to see these movies. Hell, we will start lining up to buy tickets as soon as you mention the title. And that's the exact problem. If you own a monkey that can do a perfect William Shatner impression, you're not going to bother to also train that monkey not to fling poop at people. People will be so eager to see the Original Kirk Monkey that they'll show up even if there's poop everywhere. Likewise, the premise of the Public Domain Monster Mashup is so inherently attractive that studios have realized there's no need to put in any effort beyond creating or buying the rights to the concept. You've already got a guaranteed audience who will show up to watch Joan of Arc punch zombies or whatever, so why bother with story or plot or character development or monsters that don't look like they fell out of a computer in 1992? So inevitably, audiences show up to see these great-sounding concepts, only to walk out feeling dirty and used, like we've just had a bunch of poop thrown at us.
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This didn't stop us from catching that other summer blockbuster, Movie Audiences vs. Poop Monkeys.