I remember it well. I saw it on its first broadcast on June 13, 1961. Of course, I didn't know the name of the episode's star and didn't learn it was Shatner until years later. But Bill (I call him "Bill") had a long apprenticeship on stage, B-movies, and TV before hitting it big.
Sometime in the mid-'80s I attended a program led by James Doohan who spoke about his life but mainly his association with "Star Trek." Whenever he would speak of Bill, he would always sarcastically call him "MISTER Shatner."