Reuse began early on in TOS

[neoworx]

A long time ago I had that moment of epiphany when I finally came to realize just how much stuff was reused throughout all the various incarnations of Star Trek. But I recently tripped over an example that really brought that concept home and reminded me that it started early. VERY early!

http://wrathofdhanprops.blogspot.com/2014/03/orange-is-new-whatever-we-need-this-week.html

D