Cook made two guest appearances on the CBS courtroom drama series "Perry Mason". In 1958, he played Art Crowley in "The Case of the Pint-Sized Client", and in 1964 he played Reelin' Peter Rockwell in "The Case of the Reckless Rockhound". Cook portrayed lawyer Samuel T. Cogley in the "" 1967 episode "Court Martial", Isaac Isaacson on the "Batman" television series, Weasel Craig in "Salem's Lot", and later had a long-term recurring role as Honolulu crime lord "Ice Pick" on CBS's "Magnum, P.I." He appeared too in "The Bionic Woman" episode "Once a Thief" in 1977.