I've got the perfect idea for the plot:
Ulysese Klaw, an Eastern European scientist wanted for preforming several inhumane experiments, makes his way to the nation of Wakanda, which has no extradition treaties with the other neations of the world. Klaw requests access to Wakanda's Vibranium supply, but is denied. He is then contacted by the king's eldest son, Jakarra, who cuts a deal with Klaw. Later, Klaw, with a group of mercenairies, tries to steal some Vibranium while the king, T'Chaka, is inspecting the facility where it is held. In the insuing chaos, Klaw fights T'Chaka and shoots him in the head point blank, but not before losing his hand. He flees with the Vibranium, and Jakarra ascends to the throne. Jakarra then cuts a deal with Klaw: Klaw may preform all the experiments he likes and may fund them through any and all illegal activity, as long as he leaves the government of Wakanda alone and gives Jakarra a cut. Jakarra's younger brother, T'Challa, wants revenge for his father's death and knows that his brother was involved. But, unable to do anything, he leaves Wakanda and atends boarding school in America.
Many years later, T'Challa is a well educated young man in fine physical condition. When he learns that his mother is dying, he returns to Wakanda. After his mothers' death, he tells Jakarra, now a very corrupt leader who acts more like a mob boss than a king, that he has decided to remain in Wakanda, but wishes to live in the capital city and forgo the riches of the royal palace. He moves into the city and becomes a high school science teacher. The city, which was once a beautiful tribute to the enginuity of the people of Wakanda, is now run down and on the verge of colapse, as is the rest of Wakanda. T'Challa, however, has alterior motives. Donning the ceremonial garments of the Panther King, he takes up the role of an urban vigilante to clean up his country, taking out several gangs, including Klaw's criminal organization. This aided by his being able to steal samples of the heart shaped flower, a steroid like plant that the Panther King uses to become the greatest warrior in Wakanda, from the palace.
There would, probably, be three films. One where he fights and gets revenge on Klaw, seemingly killing him, one where he challanges Jakarra, who is now addicted to the heart shaped flower and incredibly paranoid, for the throne and takes his rightful place as king, and the final one with Klaw returning as a sort of ghost in the machine.