The opening scene with a pajama'd man staggering in the desert, sunburned and disfigured, was the first "shock" I had ever experienced.
The camera slowly closed in on the man staggering, then he fell .. (face down, I think) .. and he slowly rolled over ...
Leo G Carrol, I think.
Same here....I was about 6 years old, as I recall, and it was on KTLA (Los Angeles) one Sunday afternoon.
Surprisingly, I didn’t end up arachnophobic, LOL!
Yes, I do believe that was Leo G. Carrol. Great film; a classic.