During the rite of succession, T’Challa drinks a sacred potion that lights up his veins, whereupon he drifts off, astrally speaking, to meet his father, T’Chaka (assassinated in Captain America: Civil War ), on “the ancestral plane.”
Taking place shortly after the events of Captain America: Civil War (the first Phase 3 film isn't required viewing, but it definitely helps), Black Panther opens on its titular badass (Chadwick Boseman) returning home to the hidden African nation of Wakanda after handing over Zemo (Daniel Bruhl) to the American government.
Chadwick Boseman already played this superhero in 2016's Captain America: Civil War, a supporting role in a Marvel Comic Universe best categorized as #AvengersSoWhite.
The film begins right where “Captain America: Civil War” left off, T’Challa (Chadwick Boseman) returns home to Wakanda, a country hidden from the world where science and technology reign supreme, to take his place as King, after his father, King T’Chaka, was killed in a bombing at the Vienna International Centre.
Chadwick Boseman, first introduced in Captain America: Civil War, returns as Prince T’Challa, who following the death of his father (John Kani) assumes two roles: those of the king and superpowered protector—known as the Black Panther—of the African nation of Wakanda, which keeps its riches hidden from the outside world under the guise of being a Third World country.
Black Panther picks up shortly after the events of Captain America: Civil War.