By this time in the series, if you are binge viewing like I did, you notice the frequent borrowing of other plots and ideas from other sources. This was so common in 1970s sci-fi as to actually tarnish the reputation of some, otherwise worthy, shows. It was probably done to keep costs down, but also because most studios simply saw science fiction as a money generator, and not a literary genera unto itself.
This story was borrowed from, most recently, the original Star Trek Season 1 episode "The Enemy Within," written by Richard Matheson. The idea of dividing a person into good and evil is not as well explored in this show, but it is interesting nevertheless.
The other thing I am noticing is the use of Star Trek sound effects. machine sounds, computer sounds, even the "swoosh" of the doors as they open and close. Again, a cost saving tactic often used in expensive science fiction shows of the 1970s and 80s.
This story was borrowed from, most recently, the original Star Trek Season 1 episode "The Enemy Within," written by Richard Matheson. The idea of dividing a person into good and evil is not as well explored in this show, but it is interesting nevertheless.
The other thing I am noticing is the use of Star Trek sound effects. machine sounds, computer sounds, even the "swoosh" of the doors as they open and close. Again, a cost saving tactic often used in expensive science fiction shows of the 1970s and 80s.