Update Review Scotties line when asked by the alien what the fourth bottle of booze was, drunkenly says after sniffing it, "Well, it's green!" Thats classic! An average overall Trek episode, thats not a put down because an average rating to me means very good compared to other sci fi shows which seem to be very very dull. Another reviewer here (I am assuming a young or somewhat young one), slams this episode for too much Scottie, excuse me? You are joking correct? The scene with Scottie getting the alien drunk under the table is all time best Trek material. Hello, this was made in the 60's.... miniskirts are worn by the female crew, Kirk is tagging as@ throughout the galaxy.... and Scottie has some booze stashed onboard without the preaching of a ex junkie liberal bartender (as in STTNG) to make you make you feel guilty that you want to kick some alien as@! This is what sets TOS apart from all the rest, its that they could GET away with it! And lets look at that Scottie point anyway, the ship was a DRY ship, just like a modern day US Navy ship is (McCoy had some booze just like a US Navy ship (1960-1980's) had for a pick me up shot if you fell overboard (saw a guy that got one), they don't even have that anymore). I love that TOS took the concept that these were starSHIPS, mostly because I am a Navy vet, but I mean not to stir up inter-service stuff, but if this was like a Army/Air Force gig, it wouldn't hold the charm of these rouge personalities like a Scottie in my humble opinion. Shore leave with the Army or Air Force, boring, lets go Navy! Anyway, this episode is cool, they kill the redshirt crewman in the beginning and they didn't pick the black male but the white female, I thought that was genius writing. Putting the black male (who had a few lines also, kudos's) in that role was awesome but hey, that was late 60's TV, Trek was very supportive of minorities in the future and nurtured my social liberal ideals. I could delve more into this episode but it is a good episode and holds up great to season two's standards. 7 of 10 (even after repeated viewings).
Update 13 years later: I watched this again, after a 13-year hiatus, this time with my wife and not alone as the many times before either on DVD or commercial TV with commercials in the 70s and 80s. She enjoyed it and laughed at the back shots of the Kelvan woman, Kelinda. I told my wife this was made in the swinging 60s and the reason why I would love to watch it as a teenage kid; it was my favorite show after school while growing up! The ending is over simplistic and we never see them go back across the great space barrier that had infected three Federation crewmen in Where No Man Has Gone Before, nor did any of the crew get it in this episode either as they go across; despite happening at least two times before in Star Trek history (the USS Enterprise 2 persons and the USS Valient, 1 infected). So, not to be taken too dramatically (except the early killing scene) and more of a humorous episode that's memorable almost as much as The Trouble with Tribbles, 7 of 10.