David Ajala is a British actor. He is known for his roles as Manchester Black in Supergirl (2018–2019), Captain Roy Eris in Nightflyers (2018), and Cleveland "Book" Booker in Star Trek: Discovery (2020–present).

Manchester Black is a fictional character in American comic books published by DC Comics, in particular those featuring Superman. He was created by Joe Kelly and Doug Mahnke in Action Comics #775. Introduced as an antihero, the character later becomes a supervillain.