Here is the official synopsis released by Marvel Studios:
Marvel Studios’ Black Panther follows T’Challa (Boseman) who, after the death of his father, the King of Wakanda, returns home to the isolated, technologically advanced African nation to succeed to the throne and take his rightful place as king. But when a powerful old enemy reappears, T’Challa’s mettle as king—and Black Panther—is tested when he is drawn into a formidable conflict that puts the fate of Wakanda and the entire world at risk. Faced with treachery and danger, the young king must rally his allies and release the full power of Black Panther to defeat his foes and secure the safety of his people and their way of life.
Black Panther opens Feb. 16, 2018. The film stars Chadwick Boseman as T’Challa, Michael B. Jordan, Danai Gurira, Lupita Nyong’o, Danai Gurira, Daniel Kaluuya, Martin Freeman, Angela Bassett, Forest Whitaker, Andy Serkis, Letitia Wright, Winston Duke, Florence Kasumba, Sterling K. Brown and John Kani.