I have a very distinct memory of watching an episode of this show during its initial run. It was around 1963, and I would've been 3 years old.
I recall there was a large creature that looked kinda like a brontosaurus, but with a horn on its nose. I also recall being really scared it was gonna get Steve Zodiac!
So I get the boxed set of the series, and episode 11 is...Space Monster! With a giant creature like a brontosaurus with a horn on its nose! And I was still scared it was gonna get Steve Zodiac!
OK, maybe not but I did cause my very young daughter to run for my lap when I said "Oh no, it's gonna get Steve!"
Full circle. Ah, youth...