Star Trek - Tomorrow is Yesterday - visual effects comparison

About 6 years ago, I found out that CGI improvements have been made to all the Star Trek episodes. If you watch Star Trek on Netflix, you will see the new and improved version of each episode. So for those of you who haven't seen Star Trek in decades, now you know why you some differences that you know we're not there in the original special effects. It is an improvement and it does not take away from the original. I'm sure most of you will agree. This episode cryptically discusses a black hole affecting them going back to the 1960s. SpaceTime paradoxes are discussed and how to fix picking up 2 passengers from the u.s. Air Force and putting them back in their original places.