Brainlock

Although this episode was entertaining in and of itself, and shows that computerized implants can be abused by the criminal element to force a person (Lt. Fredricks) to do unspeakable things, it is interesting that an apparent temporal discontinuity is present in the form of the recently deceased Lt. James Brody... Recall in episode "Spindrift", where Lt. Hendricks is taken prisoner, Lt. Brody dies during the rescue attempt... Then we have the episode "Second Chances" where the ship goes back in time (Lt. Brody still dead in this episode) to prevent the annihilation of Earth from nuclear missiles during the Cuban Missile Crises... They succeed and Earth is safe, and they return to their own time...

Fast forward to this episode, Brainlock... Lt. Brody seems to have pulled a miraculous Lazarus on us... He's back alive and kicking...

Could this have been an effect of time travel from the episode "Second Chances"? Butterfly effect? Maybe the crew left something out of place back in 1962 and the global effect of it was such to keep Brody from dying? I don't know, but as they say, no one really ever dies in science fiction...