A compact, serious actor, Plummer's work often falls into the category of "Black hoodlums," but he always brings a sensitivity to those roles. Plummer has worn dreadlocks for most of his roles regardless of the characters' so-called class distinctions. After receiving training at the East Bay Center for the Performing Arts and the Contra Costa Performing Arts Center, he began his career in TV. In 1987, Plummer made his debut as an unsavory character in the NBC miniseries "Hands of a Stranger" and followed as a street tough in the biopic "The Father Clemens Story" (NBC, 1987) starring Louis Gossett Jr. Subsequently, he appeared as a gang leader in "The Women of Brewster Place" (ABC, 1989), as a man who had recently moved to the neighborhood just prior to the Watts riots in "Heat Wave" (TNT, 1990) and as a gang leader in Steve Anderson's short film "Hearts of Stone" (Showtime, 1991). Plummer made occasional guest appearances on series including "Beauty and the Beast" (CBS, 1987), "Tour of Duty" (CBS, 1988) and the premiere of "Cop Rock" (ABC, 1990). During the first season of "ER" (NBC, 1994-95), he played a recurring role as a member of the emergency room's support staff.