When; Night at the Creepy Museum

In every mythology When's have existed. The fact that these beings are said to be the child of more than one realm in every mythology is all they have in common. In most folk-lore there are 5 dimensions. One is said to be a straight line, 2 is said to be right and left. 3 is our world. 4 is another direction branching off of our world. Some myths call it Ya, others call it Oae, some even call it Itoi.
The last one is the 5th which is believed to be time. Most scientists believe myths about When's are either time travellers or cross dimensional travellers. But no one knows for sure. Do you have a When in your family tree?"