User:Chubby Potato/Sandbox/MOPS

Because the nature of alternate realities in the DWU can vary, I have designed a system called the Multiversal Organization and Perspective System, or MOPS. This system is designed to take into account any way that a story might handle its alternate reality. This classes realities by letters and subtype numbers with respect to their relationship to the main reality, which in this case will of course be N-Space.

Type A
Realities of Type A are those that are completely separate from the prime reality. This has the following subtypes:

Type A0: The prime reality the system is being used for. The MOPS system is designed for use with N-Space, but may be compatible with other models; please ask your manufacturer for details.

Type A1: The reality can be considered a "universe" that has existed separately from the prime reality since the beginning of both their timelines. It can be said to have been created “naturally”, i.e. in a Big Bang. Type A1 realities have their own histories that may or may not differ significantly from that of the prime reality, and they may be the same up until a certain point. This would most commonly be called a 'parallel universe', though this terminology is also applied to other types.

Examples: E-Space, Inferno universe Barusa's universe, Federation universe

Type A2: Often called a "bubble universe", this is where the reality is actively separated from the main one. This can happen naturally, or through artificial means. Also called a "pocket universe", "pocket dimension", etc.

Examples: House's universe (natural), Adric's bubble universe from The Boy That Time Forgot (artificial), Gallifrey's pocket universe (artificial), Celestial Toyroom (artificial)

Type A3: These are realities that are somewhat separate from the prime reality, yet possess some interconnected link with it and often unusual properties of existence. These are also sometimes referred to as "pocket universe", "pocket dimension", and the like

Examples: Time Vortex, Land of Fiction, Mictlan, Obverse

Type B
Here things begin to get a bit more complicated, since they involve changes to the timeline.

Type B realities are those that share a past with the prime timeline, and then diverge at a certain point to exist alongside it, like a tree branch. This can happen naturally due to some anomaly, or due to interference caused by time travel. The way some multiverse-themes fiction treats these realities implies that they still share the same past as the prime timeline, while others imply that they "back-generate" their own identical past, becoming functionally similar to a Type A reality. DWU material such as Doctor Who Unbound seem to use the latter, but it is not always clear.

Type B1: Diverges and exists alongside the prime reality. They are variably described as "alternate timelines" and "parallel universes", even if they're not parallel from a traditional two-dimensional geometry perspective.

Examples: Pete's World, Silurian Earth, the Axis's worlds,

Type B2: When a Type B1 timeline is undone/negated, effectively severing the branch at its divergence point. Either the reality ceases to exist, or an "oxbow reality" is left behind.

Examples: Donna's World/Sanctum of the Heretic, Kingdom of Beasts

Type C
Type C realities are those that involve the "overwriting" of the main timeline, usually due to time travel or other temporal interference. These can also be reverted to restore the main timeline; generally the reality ceases to exist. Almost always called an "alternate timeline".

Type C1: Temporal interference, be it some "natural anomaly" or a time traveller, causes the usual timeline to change.

Examples: The Trickster's World, River Song's World, Sea Devil Earth

Type C2: This was the main reality until something/someone negated it, or was prevented from happening in a bootstrap paradox.

Examples: The Year That Never Was, ,

Type D
Type D realities are a strange sort, where different versions of events seemingly coexist in the main timeline. They can't exactly be considered separate, nor can they be considered the same. Sometimes called a "palimpsest universe", especially when they are caused due to external alterations to the timeline. These don't have subtypes... yet, at least.

Examples: Infinity Doctor's reality,, Salamander's 2018 vs Yasmin Khan's 2018

Compounding reality types
The above reality types can be compounded. For example, suppose in Pete's World one decides to visit the Land of Fiction. This is ostensibly a separate Land of Fiction from the one connected to N-Space. Pete's World is a Type B1 reality, and the Land of Fiction is a type A3, so this "Pete's Land of Fiction" is a Type B1A3 reality-remember, everything is in comparison to N-Space. Theoretically, this could compound forever…

The only example of a compound alternate reality I can think of is at the moment is in Aftershocks, but it's not yet clear what type the Warrior's universe is, which this timeline is a Type C2 of, is of Type A1, B1, C1 or C2.) Maybe there are others I just don't know of.