Dormammu

"Now come, my murderous minions -- follow in the paths of the Dread One!"

- Dormammu, the Dread One.

Dormammu is a powerful extra-dimensional villain from Marvel most commonly associated with Dr. Strange - being one of the Sorcerer Supreme's most recurring and powerful enemies, though he has appeared in other titles as well, most notably Marvel vs Capcom 3 as a playable fighter.

Nature
Established from early on as a warlord from an evil dimension labeled the Dark Dimension he is a creature that seeks universal conquest and has identified Dr Strange as one of the most prominent threats to that goal, for this reason Dormammu has tried many times to destroy the mystic hero but despite his vast power has always failed to do so.

Dormammu often has himself to blame for these defeats however as he often allows his arrogance to get the better of him and he can be somewhat easily tricked by people that know what they are dealing with - of course these flaws may also be the only real things preventing Dormammu from taking over all of reality, given the amount of power he has at hand.

Villains associated with the Dread Dormammu include Baron Mordo, an evil wizard and archenemy of Dr Strange, Umar (his sister) and Satannish, a powerful demon-lord created by Dormammu as an extension of himself - all of these beings have faced Dr Strange on regular occasions and are considerably powerful yet dwarfed by Dormammu himself (even Umar, who is of the same species as Dormammu, is unable to match her brother in raw mystical-power).

Television

 * Dormammu was the master of Brother Mordo in Spider-Man the Animated Series. Here, he was depicted as a Galactus-like figure who travelled from Dimension to Dimension, devouring their mystical energy to sustain his life-force. He needed the help of Mordo to break into our universe and drain it of life. Mordo pursues the Wand of Watoomb to allow Dormammu into this dimension but is opposed by Dr. Strange and Spider-Man. Dormammu was shown to be bad-tempered and an extremely impatient and abusive master, using his power to throw Mordo against walls for failing him, ranting that he is doomed when Mordo first fails to capture the Wand and calling his disciple a weak fool when he is bested by Strange. He grabs the Wand of Watoomb whilst Spider-Man and Strange are distracted and drags it through the portal that Mordo has opened into his dimension. Spider-Man and Strange pursue the Wand and manage to get it off Dormammu, before crossing back through the Portal. Dormammu then dragged the brainwashed Mary-Jane Watson through the Portal into his Dimension in an attempt to possess her and use her as a vessel to cross through into this universe but Mary-Jane was strong enough to resist him and walk back through the portal on her own before Strange closed it with the Wand of Watoomb. Not to be outdone, Dormammu sent Mordo to give the Symbiote to serial killer Cletus Cassidy, turning him into the terrifying Carnage and recruiting him as a disciple. In this episode, Dormammu was noticeably calmer, more patient and more respectful towards Mordo.
 * Dormammu is the over-arching antagonist of the animated TV movie, Dr. Strange: The Sorcerer Supreme. Here, he was depicted as the embodiment of all dark magic and was imprisoned in the Dark Dimension by the Ancient One after attempting to conquer Earth. At the time of the film, he is draining energy from Earth children in order to increase his own power so that he could break free and rule reality. When Mordo is turned away by the Ancient One, he communicates with Dormammu, offering to help him gain freedom in exchange for Dormammu making him Sorcerer Supreme. Dormammu agrees and sends Mordo to kill the Ancient One. Having done so, Mordo attacks the Ancient One's assistant Wong as Dormammu begins to make his emergence. Strange arrives to fight Mordo and swiftly gains the advantage. Dormammu emerges and puts his minion out of his misery by devouring him. Dormammu begins to unleash monsters from around the world but Strange who is able to absorb magic remembers that Dormammu is a being of pure magic and absorbs the magical blasts Dormammu is attacking him with. Dormammu soon vanishes after putting all of his energy into attacking Strange and becoming completely absorbed by him.

Powers and Abilities
Dormammu is nearly godlike in scale, capable of taking on some of the most powerful beings in Marvel continuity and surviving, his power was even great enough to spawn a sentient being such as Satannish and his entire form is made out of raw magical-energy, only serving to boost his considerable power further - he is an object of worship by thousands, if not millions, and the worship he receives also fuels his power and as such he could be considered the most powerful opponent Dr Strange has faced.

Dormammu is composed of pure mystic energy, eclipsing even the greatest of sorcerers in terms of raw power and the ability to manipulate the forces of magic, including Doctor Strange and the Ancient One, which is increased and replenished, at least partially, by worship throughout various dimensions. Among many examples, he is capable of interdimensional limitless astral projection, matter transmutations, interdimensional teleportation, size transformations, elemental control, time travel, projecting energy manifestations ranging from force bolts and cursed conflagrations to magically-constructed beings, changing his appearance, or empowering others to such a point that the empowered one wields power dwarfing even that of a dimension's Sorcerer Supreme. He can draw upon the power of the entire Dark Dimension, but is somewhat more limited when present in another universe.

Dormammu is virtually indestructible and immortal due to his energy form composed of pure magic, and has strength, speed, and stamina, which he can directly empower to levels shown capable of challenging a slightly angered Hulk, or by growing to gigantic size. Dormammu is a capable hand-to-hand combatant, trained in an extra-dimensional fighting style, but was once bested by the well-trained human Doctor Strange when neither was using mystic powers. His chief resources are his tremendous magical powers and considerable intellect.

In Spider-Man: The Animated Series, Dormammu is a gigantic but immensely slow demon who is capable of altering his size and shape, even transforming into a dragon at one point. He can send magic to help his minions in other universes via the use of portals and can also control people's minds and possess them.

In Dr. Strange: The Sorcerer Supreme he is a being of pure dark magic and can control people through dreams whilst draining them of their life-force and is also able to summon and command magical beasts.

Spider-Man

 * I'm DOOMED! DOOMED! I need the Wand of Watoomb! Bring it to me, no matter what the cost! - Dormammu tortures Mordo
 * I hunger for new energy to devour! Release me into your universe! - Dormammu on the cusp of victory
 * Give me the wand! No! - Spider-Man defies Dormammu
 * Do not reject me! That is the one thing you cannot do! No! - Dormammu attempts to control Mary-Jane
 * No! - Dormammu in general

Dr. Strange

 * You have failed me!
 * You are but frightened children, fighting a god!