“You have a civil tongue in your head! I know, I sewed it there!” Herman Cohen had a running theme of corrupt father figure scientist who turn vulnerable young men (generally, although there was a distaff version and a chimp!) in their care into murderous tools. I explicated this a bit in my Konga review, where I also noted the fact that American actor Whit Bissell and Brit thesp Michael Gough were pretty exact analogues for each other.
Cohen’s two biggest monsters then joined up, sort of, in the wonky How to Make a Monster. Sans Landon, of course.