Ever wondered if there was anyone who kept a watch over all the crossovers that ever happened? Well, this is the story of them. The Dimensions Uniting Multiverse Bureau is an organization dedicated to keeping a watch over every single interdimensional travel happening. Their reach is wide, their funding inexplicably limitless and their technology always advanced, even in the greatest science fiction world. They are all powerful.

So of course they'll take a team comprised out of a viking with the adaptability of a dodo, a ninja with the inclination to accuse everybody of having killed his sensei, a cyborg with a violent dislike for the explanation "It's magic", and a cynical, alcoholic field agent that values avoiding paperwork over preserving sentient life, and send this collection of lunatics to Equestria, just to check on something.