You are more than welcome to join in.   I am unable to post for the next couple days but you are welcome to pop up a character sheet and join in. :)<br/><br/>Anyone who wants to join can do so.  I am going to say that Earth developed a way to transport people but could not get them back home.   The doctor got transported back but it destroyed the device that would have sent anyone else back.  Therefore, anyone can join in with the understanding that they will be stuck in New Earth indefinitely. ;)