Haynes received the most recognition for his role as schoolteacher Pete Dixon in the ABC situation comedy series Room 222, with Michael Constantine and Karen Valentine.
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Haynes appeared in a number of films and television series, such as Batman and the second Star Trek pilot episode "Where No Man Has Gone Before".
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Haynes was dropped from Star Trek because series Producer Gene Roddenberry preferred actress Nichelle Nichols over him.
Possibly as a local example of a comely California coed who was recognizable in the Los Angeles market through her appearances on the Groovy Show, Kam Nelson would be featured in the opening credits of the thoughtful 1970s Lloyd Haynes television program Room 222
Andrew Lloyd Webber | Frank Lloyd Wright | David Lloyd George | Lloyd Kaufman | Lloyd's of London | Julian Lloyd Webber | Christopher Lloyd | Roy Haynes | Harold Lloyd | William Lloyd Garrison | Lloyd Alexander | Todd Haynes | Marie Lloyd | Lloyd | Lloyd Richards | John Lloyd Cruz | Lloyd's Register | Johnny Haynes | Curtis Gates Lloyd | Lloyd Cole | Lloyd's | Lloyd Stearman | Lloyd (singer) | John Earl Haynes | Hugh Pughe Lloyd | Hugh Lloyd | Hapag-Lloyd | Clive Lloyd | William J. Haynes, II | Matthew Lloyd |