Space-Time Door (AST)

The "Space-Time Door" is the gateway to an extraterrestrial Dimension outside of Space-Time, this door was guarded by Sailor Pluto. It could be accessed from the Moon Palace or by using a Key of Space-Time obtained or robbed from Sailor Pluto. 
While the gateway seemingly gives you the ability to time travel, that in truth is not how it works. It is a gateway between dimensions. Each dimension, however, has its own point in time. As such it is possible to connect to a dimension that resembles our own past, or a potential future. This is in the form of a great marble hall, something similar in design to Greek architecture. However the various portals aren't easily observed, and seem more like a maelstrom than a room. Without a key, it can be very dangerous.
However, the very act of making that connection creates temporal drift. The two points start causing alterations in the other just by mere observation. Similar to the butterfly effect, a chain of altered events that has infinite consequences. As such, no matter how much the connected dimension original resembled our past, it will change, drifting further and further the longer we are connected. Same for the future, just from the opposite perspective.
The gateway works primarily by connecting with sister gateways in other dimensions and examining their potential futures, and likewise sharing information with other sister gateways from past points in time. They all exchange information, examine it, and attempt to direct our world in a particular direction that seems advantageous. The system has many ways to manipulate events on Earth and here in subtle manners to attempt to reach what is deemed an idle future. Sometimes this system is over taxed though and Sailor Pluto must intervene directly.
The door also contains Sailor Pluto’s potential replacements. Each is a distant relative in truth, suspended there from their original times. Sailor Pluto’s tiara is linked to all of them, and gives them access to all that she sees and does. They can even communicate with her. It is so a replacement is completely up to date on current events.
Category:A Scary Thought
Category:Sailor Moon