Whosoever holds this hammer, if he be worthy, shall possess the power of ... Thor --inscription on Mjolnir
Mjolnir (literally, "that which smashes") is the hammer wielded by Thor, the Norse god of thunder.
Odin, chief of the Norse gods, ordered the dwarfs to forge Mjolnir. The blacksmiths Eitri, Brok, and Buri used the core of a star as the mold. In the process the star exploded and almost took Midgard (Earth) with it; that event may explain the extinction of the dinosaurs, about 65 million years ago. Although powerful in and of itself, the hammer also received several potent spells from Odin, who slew the frost giant Laufey with it. Much later, Mjolnir was bequeathed to Thor, after he proved himself worthy through several trials.
With few exceptions, Thor has carried Mjolnir throughout his adventures. Thus, the history of Mjolnir is the history of Thor. Although Asgard was destroyed in Ragnarok, Thor, and thus the hammer, survived.
Mjolnir itself is already extremely durable and nigh invulnerable like the Earth metal Adamantium or the Olympian metal Adamantine, and combined with the various enchantments placed upon it by Odin, is for all intents and purposes, indestructible. It has survived heat as extreme as the heart of Suns, blasts powerful enough to destroy planets, and it has contained energy sufficient enough to destroy an entire Galaxy and even energy sufficient enough to destroy one fifth of the Universe. Mjolnir also grants it's user, which is Thor, countless mystical attributes and powers such as manipulation of the fundamental forces of the Universe such as the electromagnetic spectrum, gravity etc. Mjolnir can be used both offensively and defensively. Thor often uses the hammer as a physical weapon, with almost nothing being capable of withstanding a hammer blow or throw. It has been described as impacting with sufficient force to "destroy mountains"  and has proven capable of shattering the armor of a Celestial  A rare exception is primary adamantium. 
A few other examples of the countless abilities Thor has shown with Mjolnir are:
- Transformation: At first, Thor, in his secret identity as Don Blake, could strike the handle on the ground once and become Thor, twice and become Blake again. He lost this enchantment when he gave up his Donald Black persona.
- Worthiness Enchantment: This enchantment surrounding Mjolnir prevents it from being wielded by anyone save those who have been found worthy or anyone Thor deems acceptable to wield Mjolnir for a time; certain Asgardians, such as Skurge, have successfully lifted its handle from the ground, but not entirely lift Mjolnir itself. Thus far, this includes Thor, the Awesome Android, Odin, Tiwaz, Red Norvell, Beta Ray Bill, Bor and Captain America. To anyone else, Mjolnir cannot be lifted from the ground nor wrested from Thor’s grip. The only person shown to be able to lift it with pure strength is The Hulk.
- Mystical Link: Mjolnir obeys Thor’s commands as though it were alive, and if Thor’s will is strong enough, the hammer can pass through nearly any barrier to reach him should he so desire; Mjolnir will even carve it's way through the very center of entire planets to get back to Thor. Mjolnir can also transform Thor into his civilian guises. When Thor is a civilian, the hammer most often becomes an old wooden cane. While employing a mortal guise, Thor would transform back into his mortal form should he be separated from Mjolnir for more than sixty seconds. The sixty second enchantment no longer applies.
- Weather Control: Mjolnir grants it's user Thor's ability to command the weather. Although Mjolnir's true wielder Thor, can command the weather just as well without Mjolnir, Thor uses Mjolnir to channel and focus his ability. He uses his powers to control the base elements of a storm, ie. rain, wind, thunder and lightning. While he can do so without Mjolnir, he almost always channels the energy through it, which grants him greater control over the energy. He can create giant raging electrical storms complete with thunder, lightning, hurricane-force winds, tornadoes, tidal waves, exploding volcanoes, earthquakes and torrential rains across entire planets at a moment's notice. He can also create any of these phenomena individually. Another aspect of this power allows him to stop any of these weather conditions instantly as well. Thor can create storms on a planetary wide scale, as Thor once did at Spider-Man's request to spread a chemical agent around the world to counteract another set of chemicals released by Doctor Octopus that risked destroying the ozone layer.  and is not limited to the normal limits of Mother Nature and can go beyond what natural weather can do. Thor can also channel the storm's fury, and magnify it into extremely powerful energy blasts capable of destroying objects of high durability, such as Adamantium etc.
- Undead Lethality: Also a former religious relic, Mjolnir is lethal to undead. Thor once threw Mjolnir at a vampire, with contact causing the vampire to burst into flame and crumble to dust.
- Resurrection: While channeling his power through Mjolnir, Thor was able to ressurect a man he had wrongly killed, Union Jack and also endow the hero with electric generating powers.
- Life Force Absorption: Thor used this ability on the supervillain the Presence, who was forced to surrender before being reduced to a lifeless husk, 
- Illusion Detection: Mjolnir distinguishes images and holograms, differentiating illusions from reality: Thor once commanded the hammer to strike the meta-physical villain Mephisto, who was hiding amongst false images of himself. 
- Alpha Particles: Mjolnir hammer can harness Alpha Particles from the atmosphere and could use it to atomize any weaponry.
- Negation of Mystic Energy
- Energy Sensing: Mjolnir can detect practically all types of energy. It reacts particularly strongly to evil psychic energy.
- Cosmic Energy: Mjolnir allows Thor to produce and control Cosmic Energy to an unknown limit for a variety of purposes.
- Matter Manipulation: Mjolnir is able to manipulate matter on a vast scale, allows him to create other configurations and even allows him to transmute the elements themselves. This ability was evident when he transmuted the Absorbing Man's wood and iron body to the gas helium.
- Thermo-blast: Mjolnir has the ability to produce a Universe shaking thermo-blast capable of decimating even entire planets and beings as powerful as Ego the living planet.
- Electromagnetic Spectrum Manipulation
- Invisibility and Intangibility: It's wielder can use Mjolnir to turn themselves or others, completely intangible and/or invisible. An offshoot of this ability is that Thor can use Mjolnir to completely disrupt the phasing abilities of super humans such as the Vision, Shadowcat etc.
- Barriers: With Mjolnir, Thor is capable of creating powerful barriers, force fields and vortexes that are impenetrable. These vortexes and barriers are so immensely durable that Thor was able to completely contain the explosion generated by a life bomb, which is so powerful it would have completely destroyed a fifth of the Marvel Universe, without the vortex even faltering, meaning that Thor literally contained a blast that is capable of annihilating millions upon millions of Galaxies.
- Energy Absorption and Redirection: Mjolnir is able to absorb, magnify and return any type of force, directed towards it's user. Once the energy is absorbed, it's user can redirect it back towards the source and/or use it as a weapon of his own. Mjolnir has been able to reflect the vast and hazardous amounts of energy being emitted by the biological weapon implanted within the Wasp's body by the Skrulls back at her while all of Earth's other super humans were helpless (though possibly aided by Thor's weather abilities). Mjolnir's ability to absorb energy is so powerful he managed to absorb, contain and redirect the entire energy of the Null Bomb, which was powerful enough to destroy the entire Galaxy.
- God Blast: An Immortal such as Thor is capable of channeling different amounts of his Godly energies through Mjolnir for a single massive blast known as the God Blast. His Godly energy is so vast and powerful, that even when reinforced with the Belt of Strength, which should double Mjolnir's fortification and durability, when Thor channeled his Godly energies into Mjolinr to destroy the Brain Dome of the mighty Celestial Exitar, the hammer shattered from the amount of power Thor channeled(This is a testament to the power Thor wields as Mjolnir has been able to contain blats powerful enough to destroy an entire Galaxy without so much as cracking.) The God Blast is so immensely powerful and destructive that it has proven capable of destroying beings as large and as powerful as the Midgard Serpent and even causing such a great degree of damage to a being such as Galactus that he was forced to flee for his life. Thor has used this ability only a few times.
- Anti-Force: Mjolnir is capable of producing an indescribably powerful blast known as the Anti-Force which is capable of annihilating entire planets. This blast is so powerful that with just a single emission, Thor was capable of putting down and seemingly killing the powerful entity known as Mangog himself.
- Transmigration of Souls: Mjolnir hammer has the ability to manipulate and transmigrate souls.
- Interdimensional Messaging: Thor has used Mjolnir to send psychic messages from Earth to Asgard while sending requests to Odin.
- Image Projection: Mjolnir can project images, as Thor shows a glimpse of Asgard to fellow Avenger Iron Man. 
- Flight: Thor is capable of hurling Mjolnir with great force and, by holding onto the leather thong, is capable of flying through the air at tremendous speeds. While in an Earth-like atmosphere, Thor generally flies at roughly the Speed of Sound, roughly 770 miles per hour. However, he is capable of achieving speeds far faster than light. He can use the winds to hover and has shown the ability to fly without the aid of Mjolnir. Once airborne, Thor can cahange direction, speed and altitude.
- Teleportation: By grasping Mjolnir by the leather thong and rapidly swirling it, the wielder of Mjolnir can channel energies for the purpose of opening gateways which he and others can pass through. He can open gateways which allow him to travel across locations no matter how great the distance within moments or even across entire dimensions, as he does when he travels from Asgard to Earth and vice-versa. The hammer can also be used to create portals to travel great distances within the same dimension, a feat beyond the power of Odin himself.  Mjolnir formerly possessed the ability to enable Thor to travel through time and even turn back entire events through the generation of chronal displacement inertia, but the temporal energies of the hammer were drained when Immortus, possessing mastery over time exceeding that of the Earth deities themselves, asked Thor to use Mjolnir to save the planet Phantus and brink it back out of limbo and into the spacetime continuum, though Thor, as part of the Avengers, has been shown to be able to stop time with Mjolnir. 
- Immunity to Other Forces: Even without activating the powers of Mjolnir, Thor's hammer, enchanted by Odin, is impervious to nearly all forms of change, as he himself claimed that no power in the universe but the All-Father's could affect Mjolnir, shown when Amora's magical efforts during her first confrontation with Thor to change it into a deadly serpent availed her naught.
Alternate Reality Versions
|In the Ultimate Universe, Mjolnir was an "enchanted" hammer possessed by Thor which enables him to fly, control storms, and teleport. It also delivers a very powerful blow. However, Thor can only control Mjolnir when he is wearing his belt.||Ultimates #4|
|On Earth-10190, Mjolnir is one of the most powerful weapons in existence, especially in the hands of a violent berserker like Thor, who uses it to kill indescriminately.||Thor #499|
|On Earth-961212, Mjolnir itself, isn't magical, but the blows it strikes are. Giant in nature, few can lift it purely because of the weight. When thunder is heard, it's Thor's hammer striking a foe.||Timeslip The Collection #1|
|100px||On Earth-37072, Mjolnir is wielded by Thor. In this reality it's appearance is that of a mallet, with a long handle.||Exiles #56|
|100px||On Earth-2149, Mjolnir is wielded by a zombified Thor. In this reality Thor is no longer worthy to lift Mjolnir (presumably for being a zombie) and thus has adopted a replacement hammer, made of unknown materials.||Marvel Zombies #3|
|On Earth-4162, Mjolnir is wielded by Thor. In this reality the head of Mjolnir is curved.||Exiles #52|
|On Earth-3459, Mjolnir is in the possession of a boy called D.J., the Thor of this reality is either missing or is a schizophrenic man called Harry Wilson. In this reality the handle is not wrapped in leather (ending in a loop), but ends with a short chain.||Thor Vol 2 #59|
|100px||On Earth-9200, Mjolnir is wielded by Thor. In this reality Mjolnir looks more like a club.||Incredible Hulk: Future Imperfect #1|
|100px||On Earth-5113, Mjolnir is wielded by Thor. In this reality it's appearance is corrupted by Dormammu, with singular spikes at the hammer's end-sides.||Defenders Vol 3 #4|
Others Deemed Worthy to Wield Mjolnir
- Conan the Barbarian
- Crusader (Sarah Rogers) from Earth-9811
- Dargo Ktor
- Ultimate Hulk
- Magni Thor's son.
- Woden Thor's son from the Guardians of the Galaxy (Earth-691) future.
- Superman 
- Wonder Woman
Although an incredibly powerful weapon, Mjolnir is not indestructible. It has been damaged several times over the years:
- A force beam from the Destroyer slices it in two
- The Molecule Man dispels the atomic bonds between the hammer's molecules, vaporizing Mjolnir
- The hammer shatters after channeling an incredible amount of energy at the Celestial Exitar
- Dark God Perrikus slices Mjolnir in half with a magical scythe 
- The hammer is shattered when it collides with the uru weapons of Loki's Storm Giants followers, resulting in an atomic-scale explosion
- The most recent was by Bor
- ↑ Journey Into Mystery #101 and Journey Into Mystery #102
- ↑ Thor #440
- ↑ Thor #312 (Oct. 1981)
- ↑ Thor #388 (Feb. 1988)
- ↑ Thor throws Mjolnir at the robot Ultron with no effect in Avengers #68 (Sep. 1969)
- ↑ Thor Vol 2 #4
- ↑ Amazing Spider-Man #339 (Sept. 1990)
- ↑ Thor #332 (June 1983)
- ↑ Invaders #33
- ↑ Avengers Vol 3 #44 (Aug. 2001)
- ↑ Thor #310 (Aug. 1981)
- ↑ Journey Into Mystery #102
- ↑ Avengers #5
- ↑ Journey Into Mystery #115
- ↑ Thor #133
- ↑ Avengers #300
- ↑ Thor #428
- ↑ Avengers Annual #16
- ↑ Thor #407
- ↑ Thor #388
- ↑ Thor#363
- ↑ Earth's Mightiest Heroes #1 - 6 (2005)
- ↑ Journey Into Mystery #88 (Jan. 1963)
- ↑ Thor #282
- ↑ Avengers #300 (Feb. 1989)
- ↑ Marvel Comics Presents #45
- ↑ What If? #39
- ↑ What if? #114.
- ↑ Ultimate Avengers (2006)
- ↑ Avengers/JLA
- ↑ DC vs. Marvel'
- ↑ Journey Into Mystery #119 (Aug. 1965) & repaired Journey Into Mystery #120 (Sept. 1965)
- ↑ Avengers #215 (Jan. 1982) & restored in Avengers #216 (Feb. 1982)
- ↑ Thor #388 (Feb. 1988) & restored by the Celestials' replicoid in Thor #389 (Mar. 1988)
- ↑ Thor Vol 2 #10 (Apr. 1999) & restored Thor Vol 2 #11 (May 1999)
- ↑ Thor Vol 2 #80 (Aug. 2004). Not seen again until Thor Vol 3 #1 (Sept. 2007)
- ↑ Thor #600 (Apr. 2009)
- Thor's sacred uru hammer has been duplicated with varying degress of success over the years:
- Professor Zaxton created three duplicates of the mighty mallet using his duplicating machine, all of which eventually faded away into the nothingness from which they came.
- Orikal created a duplicate of the hammer for Ulik at the beheadst of King Geirrodur.
- Red Norvell, who once proved worthy to wield Mjolnir, was gifted with Crusher.
- Odin had Eitri and the dwarves of Nidavellir forge Stormbreaker, Mjolnir's equal, for Beta Ray Bill (Earth-616) after he proved worthy to weild Mjolnir.
- After Thor defeated an unarmed humanoid antibody of Exitar with Mjolnir, more humanoid antibodies swarmed him -- all armed with similar hammers.
- Kevin Masterson carried a toy version of the mystic mallet because Thor had so often saved his father's life.
- Odin had Thor give the enchanted mace, Thunderstrike, to Eric Masterson, who had been worthy to weild Mjolnir and served Asgard for many years before being returned to Earth.
- Tony Stark, Reed Richards, and Criti Noll created a cyborg clone of Thor with a corresponding hammer capable of electric blasts and weather control.
- Puddlegulp lifted a sliver of Mjolnir, which when struck on the ground turned him into Throg and the sliver into Frogjolnir.
- ↑ Journey Into Mystery #95 (Aug. 1963)
- ↑ Thor #139 (Apr. 1967)
- ↑ Thor #276 (Oct. 1978)
- ↑ Thor #339 (Jan. 1984)
- ↑ Thor #337 (Nov. 1983)
- ↑ Thor #388 (Feb. 1988) & Thor #389 (Mar. 1988)
- ↑ Thor #402 (Apr. 1989)
- ↑ Thor #459 (Feb. 1993)
- ↑ Thor #408 (Oct. 1989)
- ↑ Civil War #4 (Oct. 2006)
- ↑ Lockjaw and the Pet Avengers #1 (Jul. 2009)
- 2,848 Appearances of Mjolnir
- 340 Minor Appearances of Mjolnir
- 81 Media Mjolnir was Mentioned in
- 2,805 Images featuring Mjolnir
- Item Gallery: Mjolnir
Links and References
- Megingjord Thor's Belt of Strength
- Thunderstrike (Enchanted Mace)
- Stormbreaker, Beta Ray Bill (Earth-616)'s Hammer, which has the same properties as Mjolnir
- Bloodaxe (Enchanted Axe)
- Mjolnir Replica An electronic replica of Mjolnir used by the Thor Clone
- Wikipedia: Mjolnir