It's Dr. Bernard Quatermass and the film you mentioned is named "Five Million Years to Earth"
My favorite schlocky Sci-fi movie of all time.
The movie was good, but it was based on a much earlier BBC TV series from 1958/59.
https://en.wikipedia.org/wiki/Quatermass_and_the_Pit
As a 10 year old that original series scared the s**t out of me...
...and I’m still worried about anywhere called Hobbs Lane...:^)