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- Black Paradox: The titular Black Paradox is a group of people who agree to commit suicide together, but in doing so discover a gateway to a parallel universe that disgorges jewels that serve as a great power source. It turns out this alternate universe is actually the afterlife, and the jewels are human souls.
- In Dungeon Meshi, this is considered one of the Forbidden Magic. It is explained that there is a separate universe filled with limitless energy, and the magic brings that energy to the world. The dungeon is also said to be created with a similar magic.
- In the 2003 version of Fullmetal Alchemist, it's revealed that the energy source for all alchemical reactions is the souls of those who died in an Alternate Universe. Specifically, our universe.
- DC Comics' Speed Force is an extradimensional energy field that exists outside space and time and grants all speedsters their abilities.
- The Pym Particles in Marvel Comics enable Sizeshifting by transferring matter to a pocket dimension when shrinking, then transferring it back when growing.
- Marvel's Spiral uses the energy of the dimensional crossroads known as "the Wildways" to power her spells.
- The Authority: The titular team's Living Ship is powered by a baby universe.
- In PS238 Victor von Fogg discovers a means of siphoning off energy from an alternate universe that he thinks is uninhabited, but which later turns out to be a non-metahuman universe disguised as a lifeless dimension where Zodon sent his parents.
- RASL: The secret government experiments were all about drawing energy from other universes. Robert has to shut the projects down when he discovers those other universes are inhabited, and the energy drain actually kills people, rather horrifically.
- In the film adaptation of Doctor Strange magic is powered by the energy of other dimensions. This contrasts with the comics where the energy comes from beings from other dimensions.
- In Isaac Asimov's 1972 novel The Gods Themselves, human scientists create a device called the "electron pump", which can produce an infinite supply of energy by transferring matter from our universe to another universe (with different physical laws) and vice versa.
- While Speaker for the Dead doesn't have Faster-Than-Light Travel, ships can still move at tremendous speeds due to the energy they siphon from another universe. Ender is a little disturbed by the situation.
- In Star Carrier, interstellar ships are powered by zero-point energy field manipulation, in other words pulling power from pocket universes.
- In The Wheel of Time history, researchers in the Age of Legends identified an infinite extradimensional energy source that could power a new form of Channeling, the setting's Functional Magic. Unfortunately, the power source is the God of Evil, and creating a hole into its prison outside Creation ends very poorly for everyone.
- Doctor Who:
- The two-parter "Army Of Ghosts" and "Doomsday" has Torchwood attempt to harness the energy of an opening in the fabric of spacetime 600 feet above London. They believe that this will make Britain truly independent. As a consequence, the ghosts start coming through...
- The interior of the TARDIS exists within another dimension. "Flatline" features the two-dimensional Boneless, who keep leaching the TARDIS's dimensional energy and causing the Bigger on the Inside part to seep away and by extension the exterior to shrink.
- In the Stargate SG-1 episode "The Road Not Taken", an Alternate Universe version of Samantha Carter was attempting to draw power from alternate realities. An accident during a test killed her and transported the prime universe version of Carter into that one.
- Stargate Atlantis:
- Zero-Point Modules draw zero-point energy from a pocket dimension in subspace, albeit one small enough that the Expedition has a habit of depleting ZPMs shortly after finding them. The Ancients tried a reactor that drew energy from this universe but exotic particles killed everyone on the planet, and when McKay tried to "fix" it he blew up a solar system by accident.
- The episode "McKay and Mrs Miller" has an inversion — the team attempts to create a stable version of the reactor by venting its exotic particles into a parallel universe, under the logic that it has only a Million-to-One Chance of being inhabited. Naturally, an alternate version of Dr. McKay soon shows up, who politely asks his counterpart to stop destroying his universe.
- In Supergirl, Mr Mxyzptlk is an imp from within the Fifth Dimension, which is pretty much just reality-warping energy in the form of another dimension. On Earth, he can connect to his home to use this energy to power what looks like magic.
- Early editions of Advanced Dungeons & Dragons feature this:
- Magic-users and clerics/priests draw the power to cast their spells from the Positive Material Plane, the Negative Material Plane or some other plane in the multiverse.
- Undead with the ability to drain character levels receive this power from the Negative Material Plane. One undead, the mummy, gets its power to cause disease from its connection with the Positive Material Plane.
- In Hc Svnt Dracones Transcendent implants blur the lines between universes to telekinetically move objects, phase through walls, start fires, or summon small Eldritch Abominations. But, the further the user reaches (measured in Cuil), the less likely they are to survive.
- Warhammer 40,000 has the Warp, or Immaterium, which is a realm shaped by the thoughts, emotions, and mental aspects of all life within the material world and is not governed by the laws of physics we know. In a similar fashion, Psykers can draw power from this realm to fuel their abilities and shape the material world. Unfortunately, the Warp is overflowing with daemons and other horrifying entities, and utilizing psychic abilities is often enough to attract their attention.
- The Fade in Dragon Age is the source of magic in the world of Thedas. It's a metaphysical realm where the spirits of the dead go and that most can fleetingly enter when sleeping, but only Mages can remain fully conscious when they visit. Unfortunately, the use of magic can make Mages targets for the demons that reside in the Fade.
- Doom (2016): Mankind was facing an energy crisis and found an energy source in syphoning energy from Hell. Extracting this "Argent energy" is fraught with health risks note , but using it once extracted and purified is perfectly safe. Of course, beyond the health risks is the fact that you've opened a Hell Gate to syphon it, and demons can and will pour through every so often. The plot is kickstarted by one of these demons offering one of the top scientists a deal with the literal devil.
- The bad guys' plan in Dreamfall: The Longest Journey and Dreamfall Chapters involve stealing the dreams from a parallel world in order to power-up the Undreaming, a primeval force of destruction, in order to tear down the Divide between Stark and Arcadia.
- In Xenogears, there is an entity/dimension known as the Wave Existence, which is a higher plane of reality of basically limitless power. It is essentially God, but somehow wound up trapped in a monolith called the Zohar. By proximity or usage of the Zohar, one has source to an endless abundance of energy.
- In Xenosaga, the Upper Domain is a higher dimension filled with energy derived from the collective consciousness. In this game, there is the Original Zohar, which is described as a direct door to the U-DO, with access to limitless power and energy, and then there are the Zohar Emulators, which attempt to use the same "wavelength" as the Zohar but with many more imperfections and thus (while still powerful) pale in comparison to the Original.
- Nasuverse: Recurring character Kischur Zelretch Schweinorg wields the Second True Magic, "Kaleidoscope", which has the power to connect parallel worlds. He pulls this off with some of his creations:
- Zelretch's signature weapon, the Jewel Sword of Zelretch, uses tiny dimensional portals to provide its wielder with a limitless supply of Mana. The sword first appears in the Back Story of Tsukihime, where he uses it to stop an illusory moon from crashing into Earth, and later a replica of it serves as an 11th-Hour Superpower for Rin in the Heaven's Feel route of Fate/stay night.
- Fate/hollow ataraxia introduces another of his creations: the Kaleidostick, an Empathic Weapon that can generate mana like the Jewel Sword, and also download skills from versions of its wielder in parallel universes. A pair of Kaleidosticks (minus the skill-download function) feature prominently in the Alternate Universe spinoff Fate/kaleid liner PRISMA☆ILLYA.
- Hero: Businessman and scientist Silas Prescott finds a crystal which made the Prism Gate, which connects to another dimension. Power is extracted from this dimension and can power things as well as give people superpowers!
- Occurs accidentally in It's Walky!: the main faction of human villains arrived from an alternate universe, and shunted the leftover energy created by their portal into a random tree branch that was nearby. This not only accelerated the heat death of their home universe, it also created the Power Booster Rod, which ends up being a massive Chekhov's Gun for the story.
- In Narbonic future!Kelly sends back a video tape explaining that physical time travel requires all the energy in the universe, so she pretty much destroyed the universe sending that one message back in time. However, after that timeline is apparently averted Dave meets his and Helen's future daughter who says that they solved that problem by siphoning energy from other universes that don't want to exist as much.
- When confronted, the aliens from Sequential Art explain that "retardium" is generated by willfully ignorant people, and exists in another dimension as a physical material. This material can be harnessed to sustain the aliens, who operate a reality television show to keep these people glued to their sets, generating plenty of retardium. The mechanics are spelled out beginning with strip #871.
- In Orion's Arm, a "Tipler Oracle" is a Pocket Dimension created by an Archai for the sole purpose of answering a question that even a godlike artificial intelligence can't handle on its own: it's seeded with self-replicating computational material, processes the question through its entire existence through Time Dilation, and passes the answer back through a wormhole before collapsing into a singularity. Despite all this, they're still fallible.
- Whateley Universe: From Even Murphy's Law has Loopholes Chapter 3 and Chapter 5, presumably the Transdimensional Aranis-Hewley Power Station, which is based on a scientific paper called Theoretical Arguments for Extra-Dimensional Power Sources to Explain Paranormal Abilities.
- In Legend of Korra, the Spirit Vines, which comes from the Spirit World, can be use as a new energy. Kuvira mostly uses them to power her weapons.
- In the Rick and Morty episode "The Ricks Must Be Crazy", it is revealed that Rick's spaceship is powered by a miniature universe inside the battery: the people of the "microverse" generate electricity using foot-pedals, with a portion of the power being redirected towards the battery. Unfortunately, this stops working when a scientist of the microverse discovers how to create his own "miniverse" and generate free power without having to work the pedals. The inhabitants of the miniverse then create a teenyverse for the same purposes. In the end, Rick manages to restore his battery's power by giving the microverse's inhabitants an ultimatum: either they go back to using the pedals, or he gets rid of his non-functional battery (and destroy their universe in the process).