Major Story Arcs
Many years ago, Ulysses Klaw led a treacherous attack on Wakanda and its royal family. Klaw even managed to kill the king, T'Chaka, before being stopped by T'Chaka's young son, T'Challa. Klaw was repelled and left Wakanda, but not before he took back a number of Wakandans to serve as his slaves. One of these was a boy whose parents Klaw had killed, a boy named N'jadaka. Little is known of N'jadaka's time as a slave to his parents' killer, but we do know that N'jadaka harbored an intense hatred for T'Chaka, his former king. He believed that weakness on T'Chaka's part was a key factor in allowing his parents to be killed. N'jadaka became educated in the United States, adopting the name Erik Killmonger, earning a PhD in Engineering and an MBA. It is said that he even taught for a time at M.I.T.
When T'Chaka's son, T'Challa adopted the mantle of the Black Panther and joined the Avengers in New York City, Killmonger recognized the son of his hated former king. He came to New York and introduced himself, explaining the story of his abduction by Klaw and his wish to return to his native country, but concealing his hatred of T'Challa and his family. Killmonger was repatriated to Wakanda where he began to gather the resources and make the contacts that would help him overthrow T'Challa as King of the Wakandas.
Killmonger discovered the Altar of Resurrection in the the forbidden Land of the Chilling Mist. The Altar of Resurrection was built upon the remains of an ancient, powerful meteor that had landed in Wakanda in ancient times. The bizarre radiations of the Altar could even grant powers in some manner. Killmonger harnessed the Altar to empower a number of his agents - Malice, King Cadaver, Sombre, Salamander K'ruel, Baron Macabre, Madame Slay, Venomm, and others. In addition to these agents, Killmonger keeps a loyal pet cheetah named Preyy.
Killmonger's first attempt to take over Wakanda involved many battles, but was bookended by two fights he had with the Black Panther atop Warrior Falls. In the first, he handily defeated the Black Panther, tossing him over the falls. Sheer chance saved T'Challa's life. In the second, Killmonger was again about to defeat the Black Panther when he was attacked from behind by a boy who had been orphaned by Killmonger's Death Regiments. The boy's attack knocked the startled Killmonger over the falls to his death.
Since then, Killmonger has returned. His first return was as an animated corpse controlled by the Mandarin. Later, though, he was brought back from the dead, presumably by the Altar of Resurrection. He has menaced the Black Panther a number of times since then, most notably when he fought the Black Panther again atop Warrior Falls, defeating T'Challa and claiming for himself the chieftainship of the Panther Clan. It is unknown how T'Challa reaquired his role as the Black Panther.
To this day, the Black Panther has never defeated Erik Killmonger in one-on-one combat.
Powers and Abilities
Erik Killmonger is a tremendously huge and powerful man, with strength and speed capable of defeating even T'Challa, the Black Panther.
Killmonger is a revolutionary leader, well-known to all Wakandans, and even supported by some. The village he grew up in has even been renamed N'jadaka Village. His revolutionary charisma, his mastery of politics and economics, his tactical cunning, and his access to the Altar of Resurrection would likely have make him Black Panther's greatest foe even if his physical abilities were not as amazing as they are.
In addition to Killmonger's own abilities, Killmonger is always served by his deadly cat, Preyy and the Death Regiments, zombie-like soldiers created by the Altar of Resurrection. Killmonger has also been known to use many agents to accomplish his missions. Not only has he worked with the agents of his original revolution, Venomm, Malice, Lord Karnaj, Baron Macabre, King Cadaver, Salamander K'ruel, and Sombre, but he has also hired a number of American agents like Nightshade, Boss Morgan, and Hydro-Man as part of his schemes.