The Bat Cave conundrum. Of course, The Dear Rich Staff must start by noting that you don't need a trademark registration to acquire trademark rights. We alluded to this recently when we discussed the Batcave case in which DC Comics was able to stop a comic book store from using the term "Batcave" as its trademark. DC Comics had not registered Batcave as a trademark (they claimed a "common law" trademark), yet the company was able to stop a retailer. We think DC Comics prevailed in that suit because of what the judge referred to as "the almost unmistakable association" between Batman and the Batcave. In other words, Bruce Wayne got serious props and 'spect in the Second Circuit. (BTW, did you know Bruce made wine down in the Batcave?)
Takeaway point: Your ability to achieve similar rights will almost always be in direct proportion to the popularity of your work. Since few comics achieve the popularity of Batman, we think that's a tall order for The Guild of Prometheus, no matter how many marshmallows they roast.