This movie has the advantage of being a British movie. They believed in building the story though this was better done in movies like the 2 Quatermass movies, X the Unknown, Village of the Dammed etc. This movie is hurt a bit when the beast first appears. You either got the rubber suit, puppets, or the Harryhausen effects in these movies. The first few closeups give a feel of a not too detailed face model. It improves as it goes. Overall well acted for what the story is in time length and well worth seeing if you're a classic sci-fi fan. Don't forget Gorgo as well.