[s3e20] Imposter • Limited

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.

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. [S3E20] Imposter

Amidst the high-stakes thriller plot, the episode features a significant character milestone: Bud finally proposes to Harriet Sims with a piece of jewelry. The episode centers on a plot by ,

Harm's partner who has to handle the trial while suspicious of "Harm's" behavior. Bud Roberts The real Harm reaches the courtroom just as

Details on other throughout the series.

Admiral Chegwidden becomes suspicious and tests the imposter by asking about a fictional case, which Palmer-as-Harm fails to recognize as fake.

Palmer captures Harmon "Harm" Rabb Jr. at his apartment on the morning of the trial. He incapacitates Harm and uses a sophisticated process to create a life-like mask of Harm’s face, effectively assuming his identity.