This is a "Wild Mass Guess" entry, where we pull out all the sanity stops on theorizing. The regular entry on this topic is elsewhere. Please see this programme note.
Grand Unifying Guesses Computer Simulations
The following stories take place within different versions of the same computer simulation in Computer!Windy's database
There is at least a theoretical chance that The Matrix is also Instrumentality, which would add all guesses in that listing (below) to this guess, and vice versa.
Could said simulation be the holodeck? If so, and the Matrix is Instrumentality which is also purgatory, then Star Trek is purgatory and by extension, so is Doctor Who.
The Ring. Samara's obviously a rogue program in one of the earlier iterations of the Matrix.
The "real world" of The Matrix could well be a long-post-Judgement-Day Terminator world, if you discount the Animatrix shorts.
Maybe the Matrix Movies exist inside the Matrix presumably to make simulation theorists look crazy, and the Animatrix shorts were created by the robots in order to distract people from the TRUTH!!!