Sullivan Walker has: Played Drug Pusher in "The Exterminator" in 1980. Played Dr. James Harmon in "The Cosby Show" in 1984. Played Tall Man in "Crocodile Dundee" in 1986. Performed in "Misplaced" in 1989. Played K.C. in "Runaway" in 1989. Played Reverend Boyd in "The Fresh Prince of Bel-Air" in 1990. Played Dr. Booker Burghardt Mountebank in "Living Single" in 1993. Played James St. Martin in "Where I Live" in 1993. Played Barry Abanks in "The Firm" in 1993. Played Yale in "Earth 2" in 1994. Played Hal Gardner in "Lush Life" in 1996. Played Homeless Man in "The Jamie Foxx Show" in 1996. Played Mutumbo in "The Pretender" in 1996. Played Watson in "The Sentinel" in 1996. Played George Beaumont in "On the Edge of Innocence" in 1997.