I watched some of the original and some of the revival. My earliest memory of William Shatner was the first episode of Mission Impossible that I was able to follow.

My favorite bit from the revival was the episode first episode when Greg Morris guest starred. Barney was injured and Grant had to impersonate him for the denoument of the con mission. All the while he's being made up he's telling Barney how much he admired Barney as a child and didn't get enough time with him, and the punchline of the scene is Grant turning back to Barney with Barney's face and saying, "All I ever wanted was to grow up just like you."