Sloyan's television career has included brief performances on day-time dramas The Young and the Restless, General Hospital and Ryan's Hope, and guest appearances on such prime-time series as Baywatch, Quantum Leap, The X-Files, MacGyver, Party of Five, Matlock, and Dr. Quinn, Medicine Woman, among numerous others.
Sloyan has also appeared in a number of science fiction television series, including Buck Rogers in the 25th Century, in which he portrayed Barnard "Barney" Smith in the episode "The Plot to Kill a City", as well as several roles in the Star Trek franchise.