Note: The following Zazie Beetz, Danny Ramirez and Clara Rugaar interview discusses major spoilers for “Black Mirror” Season 6, Episode 4: “Mazey Day.”“Black Mirror” Season 6, Episode 4 (titled “Mazey Day”) lifts the veil on the dark side of Hollywood stardom. Zazie Beetz stars as Bo, an invasive paparazzo who will go to any lengths to snap a photo of Mazey Day (Clara Rugaar) — until a devastating hit-and-run unravels the starlet’s glamorous life and success and Bo reconsiders the morality of her profession.