"The Creeping Terror" wins the technical incompetence award. The director lost all of the sound for the movie, so he just put narration over everything, including the dialogue scenes. Believe me, "The Creeping Terror" makes "Monster A-Go-Go" look like Kubrick.
I didn't think he lost the sound, just that he couldn't afford to have sound equipment on the set and locations, so he just shot it silent and dubbed a soundtrack on separately (so that every line of dialogue is delivered while a character is offscreen or facing away from the camera). I think there are two or three MST3K movies like that.
Manos was like that but, no, for "The Creeping Terror" the sound was lost so they had to dub in the narrator's voice. Both Wikipedia and MST's Wiki confirm this.
Wait! MST3K has their own Wiki site!? WHY DIDN'T ANYONE EVER TELL ME THESE THINGS!!!!?