Slightly shorter delay between episodes this time.
This episode managed to be both expositiony and quite weird. Also robot gore.
As mentioned in the notes for last episode, the new villains have their names translated as they’re full kanji compounds, as opposed to the katakana phonetic spellings of all the other villains. Same compound is used to describe the new Motws as well.
The bit of exposition talking about Mu, is referring to the lost continent of the same name, but other bits of dialogue imply there’s an Atlantis vibe as well, as Mu was a 19th Century idea, whereas Atlantis was a 4th Century BC idea. Lemuria is a related idea and yes, that’ll be relevant later.