Synopsis by Hal Erickson
This classic episode can be described as an outer-space western, as cowardly Dr. Smith (Jonathan Harris) comes face to face with his coldblooded lookalike Zeno (also Jonathan Harris), a notorious intergalactic gunslinger. Forced to trade his clothes with Zeno's, Smith is arrested by the Law, who sentence him to be boiled in oil. Once the Robinsons figure out what is happening, they gallop (figuratively speaking) to Smith's rescue--but it may already be "High Noon" for the hapless medico. Not surprisingly, this episode is a showcase for Jonathan Harris, who requested that the script be written for him to display his versatility.