This episode introduces several narrative devices, recurring throughout the canon. Most importantly involves the brilliance behind one of the most novel exploitations of E=MC2 in early sci-fi. Unknown at the time, but the timewarp ending not only utilizes the best portrayal of spacetime in tv to that moment, but sets up scores of similar plots in a multitude of series. It's also a stunningly modern plot turn for a show that underwhelmed with critics. It signals Star Trek's linkage with hard sci fi, reaching its ostensible apotheosis with the Asimov scripted The Motion Picture. Still stands the test of time as one of the coolest endings to any episode.
Review of The Naked Time
