While looking for something else on Google images, I managed to stumble onto an early credit for Dennis Patrick. It's called The Strip Tease Murder Case. No, Dennis doesn't strip; no Chippendales in 1950. The film is sort of a murder mystery interrupted by what would be politely called specialty numbers. Dennis has dark hair in it, like Jason McGuire. And he is the only cast member to have had any long term success in acting. He is billed under his real name, Dennis Harrison. Which may be why the film remains largely unknown in DS circles. And possibly why he adopted a stage name. He appears very briefly in the trailer (which is on YouTube) but has no dialogue. The film itself is available from Something Weird, which it certainly is
Judging by what I saw in the trailer, it makes Plan Nine from Outer Space seem like Streetcar Named Desire.
It's definitely Dennis' answer to Satan In High Heels.