Re: episodes that are part of two different TV series
The Star Trek TAS episode 'More Tribbles More Troubles' was released on TAS Complete Series Disc 1 and on TOS-R Season 2 Disc 5.
"More Tribbles More Troubles" isn't part of two shows. Just one, the animated Star Trek series. It's no more part of TOS than any of the other TAS episodes.
"Of all the souls I have encountered in my travels, his was the most... human."