Star Trek: TOS 1.18: "The Squire of Gothos"
Was this the original "all powerful alien turns out to be a child" story, or was this a well-established sub-sub-genre of sci-fi by this time? It's hard to tell from this distance and you never know with the original Trek.
I dig that Trelane has a salt monster trophy from "The Man Trap," even if it doesn't fit his 19th century decor.
yr: 2267
sd: 2124.5
ad: 12 Jan 1967