“You only take a mate once every seven years?”
“The seven-year cycle is biologically inherent in all Vulcans. At that time, the mating drive outweighs all other motivations.”
“And is there nothing that can disturb that cycle, Mr. Spock?”
“Extreme feminine beauty is always disturbing, Madam.”
Well folks, I discovered that this week’s episode, The Cloud Minders, is the first episode on the last disc of my complete TOS series blu-ray. We’re definitely in the downhill slide here! But, as @Rock8man noted, this is a pretty good one. Not one I recall seeing before, but it was definitely an interesting one, with some nice conflicts and decent acting. I’ll recap a bit below:
The Enterprise finds itself on a mission to save a planet from a plant-related disease, curable only by a certain mineral from another planet, Ardana. Upon entering orbit, Kirk and Spock discover that they’re not beaming to the mines to retrieve this mineral but instead to its shining city in the clouds -
Figuring this is a mistake, they instead beam directly to the mine but are attacked by the low and devious miners who do all the work around here -

Luckily the debonair administrator of the cloud city arrives and rescues everyone from a fate likely worse than death -

Inviting them to rest for a bit, the crew are betrayed and attacked while they rest -

Luckily, the administrator captures the attacker, and submits her to torture under something called ‘the rays’ -

But Kirk and Spock make a discovery - the mineral emits stupid gas! Mining the mineral that every planet uses to protect its plant life makes you stupid! Kirk comes to Vanna, who is trying to get her people a better life in the clouds, and both decide to trust each other to hold up their end of things. But Vanna has other ideas -

So then Kirk gets free and decides to beam the administrator to cave so he can beat the hell out of him. Anyway, it all comes together in the end and Kirk and the administrator decide none of this ever happened, so I’m going to pretend it never happened too.