[s3e20]: Imposter

The episode centers on a plot by , a disgraced and rogue former agent of a shadowy federal agency. Palmer’s objective is to assassinate Lt. Colonel Ronald Vickers , a Marine officer on trial for allegedly violating a chemical weapons treaty by selling biological agents to Algerians.

While Harm is trapped, "Imposter Harm" arrives at the courtroom to prosecute the case alongside Mac (Sarah MacKenzie). Mac is initially confused by Harm's late arrival and strange behavior but continues the trial. [S3E20] Imposter

The real Harm reaches the courtroom just as Palmer (as Harm) is about to expose Vickers to a lethal aerosol nerve gas. A physical fight ensues between the two "Harms" in the hallway, where the real Harm eventually unmasks and subdues Palmer. Key Cast and Characters Significance David James Elliott Harmon Rabb Jr. The episode centers on a plot by ,