Loki is the primary antagonist of the Thor comic book franchise, and is one of the headlining villains of Marvel comics. A consummate trickster and evil genius, Loki is an immortal god whose brain makes up for his lack of brute strength. Loki is the mastermind behind the events of the Disney vs Marvel Villains War and a major player in it.
Disney Vs Marvel Villains War
Setting Up Hades
Loki is the mastermind behind the events of the war between the villains (however, as revealed in the part 2 prologue, he shares this role with the Archmage). His plan is detailed and well planned, and it very nearly succeeds in granting Loki power over all of the Nine Realms. He fires the first shot in order to start the war, which would, in turn, weaken the armies of earth and cause the Eye of Odin to come out of hiding. With tensions already existing between the villains, all that Loki has to do to set off the war was to attack Hades. Loki attacked the Underworld with his Frost Giants and does battle with Hades, throwing the fight so that he can plan in the shadows with everyone believing him to be defeated. Hades banishes Loki to the pits of the River Styx, but Loki is later released by his loyal henchwoman, the Enchantress, just as he planned. Following that fight, several others begin to break out as well. The war has begun.
While observing the early war from afar, Maleficent appears on Loki's radar as a powerful enemy. He fears that she might prove to be his competition for claiming the earth in the wake of the destruction. To test this theory, he sends the Enchantress to fight Maleficent to gauge her power. When Enchantress returns to Asgard a failure, Loki realizes the threat that Maleficent poses to his operations. He then gives the Enchantress a new assignment: create a team of Earth's deadliest villains to strike against Maleficent.
The Eye of Odin
As Enchantress recruits allies, Loki keeps a watchful eye on the tides of the war, particularly Maleficent's ever growing faction. When the Archmage enters the fray, Loki quickly makes it his business to claim the Eye of Odin from him. Loki defeats the Archmage and plucks the Eye of Odin from his brow. Wearing the talisman, Loki awakens the full power within him, making him stronger than Odin himself. Loki uses this power to recruit an army and conquer all of the Nine Realms aside from Earth, timing his attacks during the Odinsleep. Loki personally goes head to head with Thor, handing him a humiliating defeat. He then uses his magic to keep Odin from waking up.
Preparing to Strike
With eight of the Nine Realms conquered, Loki sends Malekith to Midgard to obtain the Casket of Ancient Winters, a powerful artifact capable of freezing gods. Malekith not only succeeds in obtaining the Casket, but also subdues two of Maleficent's faction members. Everything is looking extremely positive for Loki, until the Enchantress returns with news that she and the Masters of Evil have failed. Loki very nearly kills the Enchantress, but he realizes that he nilleed her power for the invasion of Midgard, so he graciously allows her to live. Once Frollo's seige of HYDRA draws to a close and Dr. Doom forges an alliance with Loki, Loki decides that it was time to prepare his armies for the invasion of Midgard.
However, Loki does not take into account the rise of Queen Grimhilde, as the god considers her magic second-rate. However, Grimhilde launches a surprise attack on Asgard, striking down most of Loki's army. Loki manages to kill the Queen, but his army is army weak to move on at this point. On top of this, Hades steals the Casket of Ancient Winters from Malekith and used it to conquer Olympus. It seems that all of Loki's plans are ruined until Doctor Doom arrives and introduces Baron Mordo and Ultron to the faction. Loki decides that with the two additions, his worcesould be just strong enough to overcome Maleficent and take command of her forces, which he could then use to replace his destroyed army.