William Horace Marshall  (August 19, 1924 – June 11, 2003) was an American actor, director and opera singer. He played the title role in the 1972  blaxploitation  classic  Blacula and its sequel  Scream Blacula Scream  (1973), and appeared as the King of Cartoons on the 1980s television show  Pee-wee's Playhouse and as Dr.  Richard Daystrom  on the  Star Trek television series. He was 6‘5” (1.96 m) tall and was known for his  bass  voice.