I only ever saw Five Million Years To Earth in the Quatermass trilogy, so seeing the first two on video was pretty cool. this movie is really good. none of the stories are connected as far as I remember, just having Quatermass as the main character. of course, since none of the movies bore the name Quatermass over on this side of the pond you would never know they were connected.
Bernard Quatermass is the prototypical British sci-fi hero. he's not always very likable, but he's very smart and the guy you want on your side.. I was intrigued to find out more about him when the teleseries these movies were based on started showing up on VHS here and there.