Star Trek - Tomorrow is Yesterday - visual effects comparison

This is a video comparison of the visual effects scenes from the classic Star Trek episode Tomorrow Is Yesterday by D.C.Fontana. On the left side you can see the scenes from the 1966 edition of the episode, on the right side you can see the same scene as it appears in the 2009 digitally enhanced edition. STAR TREK and related marks are trademarks of CBS Studios Inc.