The episode "What Are Little Girls Made Of?" from the original "Star Trek" was exciting and one of the better shows in the series. In it, an old love of Nurse Chapel is discovered alive on a seemingly barren planet. She and Captain Kirk beam down...only to discover that the man was mad and envisioned replacing key Federation figures with androids under his control.
Why do I mention this show? Because the plot from the "Voyage to the Bottom of the Sea" episode "The Cyborg" is essentially the same plot in many, many ways. A crazy doctor (Victor Buono) has learned to create perfect androids and is planning on using them to start Armageddon...and his ultimate goal is for his robots to arise from the rubble and then rule the Earth...or what's left of it. To do this, he holds Admiral Nelson prisoner and substitutes an evil identical to go to the Seaview and launch its nuclear arsenal!!
All in all, this seems to be an example of 'imitation is the most sincere form of flattery'. A very good episode of the show was remade just a year later! Well worth seeing...and one devoted Trek fans might just want to see themselves.