Played both the real Harm and the imposter (Palmer in disguise). Clark Palmer

Alan J. Levi (though some sources credit Kenneth Johnson).

The one who ultimately saves Harm from the booby-trapped apartment. Ronald Vickers

" Imposter " is the 20th episode of the third season of the military legal drama , which first aired on April 21, 1998. It is widely remembered for its high-stakes plot involving a literal imposter attempting to commit an assassination in a courtroom under the guise of the series protagonist. Plot Summary

Imposter — [s3e20]

Played both the real Harm and the imposter (Palmer in disguise). Clark Palmer

Alan J. Levi (though some sources credit Kenneth Johnson). [S3E20] Imposter

The one who ultimately saves Harm from the booby-trapped apartment. Ronald Vickers Played both the real Harm and the imposter

" Imposter " is the 20th episode of the third season of the military legal drama , which first aired on April 21, 1998. It is widely remembered for its high-stakes plot involving a literal imposter attempting to commit an assassination in a courtroom under the guise of the series protagonist. Plot Summary which first aired on April 21