Star Trek Thoughts: More Tribbles, More Troubles

There's just one episode of "The Original Series" on one of the Blu-Ray discs in the second season Star Trek collection. A partial explanation for this might be that "The Trouble With Tribbles" is augmented not just with "bonus content" but two follow-up episodes from later series. Before I bought the Blu-Ray sets I had watched my way through two "Best of" DVDs, one of which had the original episode on it, and as for Deep Space Nine's thirtieth anniversary time-travel episode I can remember having seen it years before. In between them, though, I was interested for my own reasons in seeing one of the animated episodes from 1973...
( 'That tin-plated overbearing excuse for a starship captain did it to us again!' )