The Marvel Cinematic Universe is full of heroes. However, these heroes are out of a job if they don't have a good villain to fight. Here are my opinion of the top 10 Marvel Cinematic Villains. This doesn't include villains from the X-Men franchise of the Fantastic Four franchise.
Starting off this list is Malekith from Thor: The Dark World. Malekith is the leader of the Dark Elves, a race that is supposed to be older than the universe itself. Malekith led the Dark Elves into a war against the Asgardians using a weapon called the Aether. They were defeated in battle by the Asgardian king, Bor. Malekith survived and went into hiding until the Convergence (when all Nine Realms align together) to try and take back the Aether. He was defeated again by Thor.
9. Aldrich Killian
Ninth on this list is Iron Man 3's Aldrich Killian. Aldrich Killian turned out to be the actual villain of Iron Man 3, because Marvel decided a Mandarin plot twist was necessary. Aldrich Killian was the founder of Advanced Idea Mechanics, or A.I.M. After Tony Stark wouldn't fund his projects, Aldrich instead experimented with a new substance called Extremis. His plan was to develop Extremis powered super soldiers. To hide his terrorist activities from the public, he created the Mandarin to take credit for the attacks. He conspired with the Vice President to control both sides of the War on Terror. He is killed when Pepper Potts hits him with a repulsor blast.
8. Red Skull
Eighth on this list is Captain America: The First Avenger's Red Skull. Johann Schmidt was the commander of the Nazi military science division, HYDRA. He was a brilliant scientist, and eventually became the confidant of Adolf Hitler. His burning desire to become a superior human led him to test the Super Soldier Serum himself, resulting in his Red Skull transformation. After gaining the powerful Tesseract, he decided to try and take over the world for himself. His nefarious plans were foiled by Captain America.
7. Iron Monger
Obadiah Stane from Iron Man takes the seventh spot on this list. Obadiah Stane was a businessman who headed Stark Industries after Howard Stark's death. He became second-in-command after Tony Stark eventually became old enough to be able to run the company. Wanting to be the head of Stark Industries again, he hired the Ten Rings terrorist organization to kill Tony. Instead of killing Tony, they capture him and force him to build weapons for them. After Tony escapes, he covertly steals the Mark 1 armor and makes it bigger and better. He learns that Pepper Potts learns of his plan to kill Tony. He then takes Tony's arc reactor out of his chest, leaving him for dead. Pepper and other SHIELD agents go to arrest Obadiah, but they are no match for his new suit. Tony is able to get a replacement arc reactor for his chest and kills Obadiah in a reactor explosion.
Darren Cross from Ant-Man comes in sixth place on this list. After Hank Pym was voted out of his own company, Darren Cross took his place as CEO. For years, Darren was obsessed with Hank's Ant-Man suit and eventually was able to replicate its abilities into the Yellowjacket suit. He intended to sell the Yellowjacket suit to HYDRA, but donned the suit himself when Scott Lang arrived to stop him. The transaction was foiled, but this drove Darren to travel to the home of Scott's ex-wife's house and hold his daughter Cassie hostage. He was killed when Scott shrank through the suit's molecules and disabled the suit's internal mainframe.
5. The Winter Soldier
Fifth place on this list goes to the Winter Soldier from Captain America: The Winter Soldier. Yes, I know he's technically not a villain anymore, but that doesn't mean he never was. After falling from the train in Captain America: The First Avenger, Bucky Barnes was believed to be dead. But as we know, people who die in Marvel movies never stay dead. Arnim Zola recovered his body and brainwashed him into becoming a HYDRA agent. His left arm was too badly damaged, so they had to amputate it and give him a mechanical arm. He became a deadly assassin, and is even responsible for Howard Stark's death.
Fourth on this list is The Incredible Hulk's Abomination. Emil Blonsky was a British Marine working with General Thaddeus "Thunderbolt" Ross. He was critically injured while trying to contain the Hulk. To speed up his recovery, he was given a watered-down version of the Super Soldier Serum. This injection fed his desire to get more powerful. This hunger for power led him to Samuel Stern, who later injected him with Bruce Banner's blood, transforming him into the Abomination. He proceeded to test out his abilities by going on a rampage in Harlem. After a long battle with the Hulk, he was eventually defeated.
Loki from Thor and The Avengers takes the third place on this list. Loki is the biological son of the leader of the Frost Giants, Laufey. During a battle, he was abandoned and later found by the Asgardian king, Odin. He was raised by Odin and became the step-brother of Thor. When Loki learned who his true father was, he plotted to banish Thor so he could become next in line to the throne of Asgard. His plan was foiled when Thor came back from his banishment and defeated him. He then planned to conquer Earth with the Chitauri army, given to him by a servant of Thanos. He tried to steal the Tesseract and was stopped again by the Avengers.
Second on this list is Avengers: Age of Ultron's Ultron. Ultron was a peacekeeping program that utilized artificial intelligence designed by Tony Stark and Bruce Banner. He was able to travel through the Internet and upgrade itself to multiple host bodies. He claimed humanity was the greatest threat to peace on earth and attempted to create peace by committing genocide against them. He originally had help from the Maximoff twins, but they abandoned him after realizing his true intentions. He was killed by the Avengers, but his actions led to the Avenger's reformation.
1. Ronan the Accuser
Taking first place on this list is Guardians of the Galaxy's Ronan the Accuser. Ronan was a member of the Kree, an alien race. He attempted to eradicate the Xandarians by making allies with Thanos, in exchange for the Orb. After locating the Orb, he decided to keep it for himself instead of giving it to Thanos. Using the Orb's power for himself, he used this new-found power to attack Xandar. He was stopped by the Guardians of the Galaxy by utilizing the Orb's true power.
So there's my list. Who is your favorite Marvel Cinematic villain?