And yes, there are clues to the theme of this episode in today's Out of the Vault.
Theme music is by Partners in Rhyme.
Additional music: "Destination Venus" by Man or Astroman?
The Batman--weird menace to all crime--at last meets an opponent worthy of his mettle. A strange creature, cowled like a monk, but possessing the powers of a Satan! A man whose powers are uncanny, whose brain is the product of years of intense study and seclusion!
No idea if that last sentence refers to the Batman or to the Monk. And that level of clarity will hold true throughout the story, sadly.
Alfred: How many did I kill?
Alfred: But there were only four.
Robin: You killed three of them twice.
featuring "Out of His League" starring Digger