A pocket universe or pocket dimension is a "distorted echo of a organically created" universe. Such "baby universes" occurred spontaneously but that they never last for long. However, there are also examples of artificially created and longer lasting pocket universes but a pocket universe is not a parallel universe.

Because of their short lives, unstable "temporary pocket universes" are highly dangerous to most dimensional travellers, who could only survive for a few moments before being trapped there as the universe collapsed back into the quantum foam.

Examples of pocket dimensions or baby universes are listed below:

The Divergent Universe was a pocket universe that had no concept of time. Rassilon considered it the most "significant" of the universes he kept inside his dungeon on Gallifrey. 

A dangerous species from the Dark Times was closed by other races in a pocket universe called the Ringpull. They were released by the Fifth Doctor and Turlough. 

The Selachee Galactic-Bank vault utilizes dimensional transcendentalism. The contents of the vault are contained in a pocket universe which could only be accessed by using the correct combination, which is changed four times per day. 

The Seventh Doctor trapped two Elder Gods in a pocket dimension that comprised of just five miles of Britain after a nuclear war. 

Hila Tacorien was once trapped in a pocket universe, and was only brought back to the normal universe thanks to the work of Emma Grayling, an empathic psychic who was able to, as the Doctor put it, act "like a lantern, shining across the dimensions, guiding her home". This pocket universe contained a large island seemingly floating in space, on which was a misty forest. Time also ran much slower in this pocket universe than in the prime universe, to the point that 1 second in the pocket universe was equivalent to 100,000 years in the Doctor's universe. 

The Celestial Toyroom was thought to be a pocket universe. 

In order to save it from the Daleks, "all thirteen" incarnations of the Doctor teamed up together to freeze Gallifrey in time and place it in a "single moment in time, held in a parallel pocket universe." While they were unsure if they succeeded, an encounter with the Curator indicated to the Eleventh Doctor that this was in fact successful. According to the General and the Doctors, the calculations necessary would take several hundred years so the Doctor worked on them for all of his various lives. (TV: The Day of the Doctor) A doorway to this pocket universe in the form of a crack in time appeared in the town of Christmas on Trenzalore. It was through there that the Time Lords sent the message "Doctor Who", which attracted the Eleventh Doctor as well as various races across the universe, and, 900 years later, with the Doctor dying from old age at the end of his final incarnation, energy for a new regeneration cycle. 

The Vess kept a immense automated weapons factory in a pocket dimension, powered by energy drawn from the Big Bang. 

Shadow-Space was an artificially created pocket dimension that stored the consciousness of intergalactic starship crew to protect them during warp flights.



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