Inter dimensional beings versus aliens

Even our scientists tell us we live in a multiverse. They just don't want to admit what that entails: other dimensions - and the beings who live there.

For centuries, humans strove to fly. Eventually we had air balloons, aeroplanes, jets, spaceships. But birds could already fly naturally - they were ahead of us. Gradually science is inventing techniques that can manipulate the first half of MEST: matter, energy, space and time. We split the atom in the 1940s. Now google teleportation: we're there already, if only at the beginning. But just as birds can fly, so there are already other creatures who can manipulate MEST naturally, just as birds can fly, and it seems they are visiting OUR dimension.