It starts with a door.
Some doors are more powerful than others.
Just ask the alien who opened the wrong door in the Grand Imperial Chinese Restaurant on the planet 427. If was looking for a lavatory after drinking too much green tea. People on Tockworld aren't grateful for their new world, of course, because for them, it has always existed. It has its own history, geology, mythology, religious wars, and broccoli. There's even a scientific theory that explains how everything began.