Changes

'''Ener-D''', spelled as '''Enerdy''' in ''[[Yu-Gi-Oh! 5D's Tag Force 4]] '' and ''[[Yu-Gi-Oh! 5D's World Championship 2010: Reverse of Arcadia]] and '', known as '''MomentumMoment''' in the Japanese version (and sometimes romanized as '''Momentum'''), and short for "duel Duel energy", is a form of energy in ''[[Yu-Gi-Oh! 5D's]]''. It is the ultimate energy generation system that keeps spinning in one direction to create an endless power supply. Ener-D is the source of power in [[New Domino City]] that keeps the city running while making the technology for [[Duel Runner]]s, [[Turbo Duel]]s, and Solid Vision possible.

In the English animedub, its name comes from the word "energy", but replacing the letters '''GY''' with a '''-D''', which stands for duelingDueling. The change may have been due to the fact that , in English, the term momentum refers to the product of a body's mass times its velocityand energy have distinct meanings in physics.

[[File:Actual Momentum.jpg|thumb|left|240px250px|Actual Ener-D system]]Kaiba Corporation's [[R.R.D.]] was in charge of this technology; the lead developers who had begun the research were [[Yusei Fudo]]'s parents, following [[Dr. Fudo]]'s discovery of the [[Planetary Particle|Planetary Particles]] which were essential to making Ener-D possible.

Kaiba Corporation's [[R.R.D.Roman Goodwin]] was in charge described the Ener-D as a near-limitless source of this technology; the lead developers who had begun the research were [[Yusei Fudo]]energy that doesn's parentst produce any contamination.

The Ener-D Reactor is implied to be a Perpetual Motion Machine, and runs at full capacity in order to meet the power requirements of [[New Domino City]]. Everything in the city is powered by the Ener-D; if the Ener-D shuts down the entire city suffers a blackout. Its limit is in its ability to channel excess energy it produces. The appearance of the [[Crimson Dragon]] during the duels Duels between [[Yusei Fudo]] and [[Jack Atlas]] caused the system to exceed its limits.

During their first match when the Crimson Dragon appeared, it overpowered the system by dramatically overflowing the energy generation to it. As it was incapable of handling so much power, the system completely shut down, leaving the city in a total blackout. The overflow problem occurred once again during the [[Fortune Cup]], though according to [[Zigzix]] it was running at full operation. Apparently some modifications had to have been made to the system, since the 2nd second appearance of the Crimson Dragon only caused the temperature and pressure within the Ener-D Reactor to reach critical point rather than cause the system to blackout as it had before.

In Season 2 is revealed that Synchro Summoning causes According to [[Bruno]], the Ener-D to spin faster, speeding up is self-aware and can read the evolution emotions of humanity. Howeverhumans, if it spins too quickly, it will shift into reverse, creating an explosion like and should a human reach the [[Zero ReverseClear Mind]]state, they can control that Ener-D.

In the future [[Z-one]], [[Bruno|Antinomy]], [[Aporia]], and [[Paradox]] came from; Humanity abused It is later revealed that Synchro Summoning causes the Ener-D's power to control spin faster, speeding up the evolution and filled of humanity in the process. However, if it spins too quickly, it with greedy desires and emotions to the point that the Ener-D went out of control and created will shift into reverse, creating an army of explosion like [[Meklord EmperorZero Reverse]]s to kill all humanity, and later exploded completely, these 2 events completely destroyed the world and hummanity. The only survivors left did various attempts to stop this apocalyptic future by going the past and erasing Ener-D from existence. These attempts literally caused the plot of both 5D's seasons and the movie Bonds Beyond Timeat a massive scale.

In the apocalyptic future that [[YuZ-Gi-Oh! 5D's - Episode 149one]], [[Bruno|episode 149Antinomy]], [[Aporia] it is revealed that the ], and [[Meklord Emperor GenocideParadox]] could be stopped by removing came from, humanity had abused the negative power of Ener-D to control evolution and filled it with greedy desires and emotions to the point that caused the Ener-D went insane and created an army of [[Meklord Emperor]]s to go out kill all of control humanity, and build later exploded completely; these two events completely destroyed the Emperors in first place, unfortunately Z-one discovered this too late world and couldn't humanity itself. The only survivors attempted to stop this apocalyptic future by going the past and erasing Ener-d before it explodedD from existence.

In [[Yu-Gi-Oh! 5D's - Episode 149|episode 149]], it is revealed that the [[Meklord Emperor Genocide]] could be stopped by removing the negative emotions that caused the Ener-D to go out of control and build the Meklord Emperors in the first place, but unfortunately Z-one discovered this too late and couldn't stop the Ener-D before it exploded. Thanks to Z-one's intervention, the present day New Domino City became aware of the situation, and Yusei created a program known as [[Fortune]], which keeps the Ener-D under control, and thus preventing the Meklord Emperor Genocide will never occurfrom occurring.

 After the Fortune Cup, the existence of the Original Ener-D Reactor was revealed within [[Satellite]]'s inner grounds. However, according to [[Rex Goodwin]], as it was the first system, it was totally insecure and imperfect when it was activated seventeen years before by [[R.R.D.]]. Consequently, the system's activation resulted in the major catastrophic event known as the "[[Zero Reverse]] Effect". This was the reason behind the destruction and splitting of [[Domino City]] into New Domino City and Satellite. The system was abandoned in Satellite, until it was "found" by the [[Dark Signers]]. According to Goodwin, the Original Ener-D Reactor was being used as a door to the Underworld.

The system possessed four safety switches located in the [[B.A.D.]] area. These were a fail-safe placed long ago after the system was shut down completely. Each of the control units are code-named with the name of one of the [[Earthbound Immortals]] and is guarded by the Dark Signer who possess the corresponding Earthbound Immortal card. The main system itself is represented by the Spider mark and is guarded by the leader of the Dark Signers, [[Roman Goodwin|Roman]].  Before Roman and Yusei's second duel Duel took place, the Dark Signers blew up the Original Ener-D Reactor. As the negative energy was released the two of them, standing above it, commence commenced their rematch. Yusei won the duel Duel but Roman blew up the bridge and Yusei fell into the reactor.

Only three of the four control units were activated, because as [[AkizaIzinski]]'s Duel with [[Misty Tredwell]] prevented her from activating the last tower in time. ==Trivia==* In the dub, Rex simplified how Ener-D worked as "powering a city with a pack of cards"; since Dueling was done by everyone by the point of discovery.

[[Category:ItemsTechnology]][[Category:Yu-Gi-Oh! 5D'sitems]]