The dark comedy movie "The Worst" has added several actors to its ensemble, including Anthony Boyle, Sam Claflin, Tom Hollander, and Josh Finan. The film also reportedly stars Keira Knightley and Alicia Vikander, although some outlets only mention Knightley. The movie is described as a dark British comedy with twists and turns, but details about the plot and other cast members are not consistently reported across outlets.