This is one for the basis of our Science fiction level of productions. We generally stick with Science, and avoid the sci-fi. What's the diff? Well science being what we accept to the within reality. and science-fiction being what is impossible and ultimately from imagination only.
So what's with the Dimensional Theory that keeps springing forth concepts, such as 2-D creatures? According to the idea that we live in a universe which is 3D, three dimensional.
2-D creatures cannot exist.. because 2 dimensional Universes cannot exist. Okay?!