Another interesting story, though I admit that the concept of the omnipotent foe is getting old after "Where No Man Has Gone Before" and "Charlie X". At least, the wrapping is different because of the childish Trelane who is a fun character that somehow reminds me of Q.
My favorite line came from Spock: "Fascinating is a word I use for the unexpected. In this case, I should think interesting would suffice."
The conclusion totally took me by surprise. Good show!