Quatermass/YMMV


 * Complete Monster: Kickalong from Quatermass.
 * Nightmare Fuel: The BBC put up one of the first ever content warnings before an episode of Quatermass II. Nigel Kneale once said in an interview he didn't want kids to watch the stories.
 * Special Effects Failure: Watch for the control rod attached to the rocket at the end of Quatermass II. Other than that, there aren't any to speak of, which is pretty remarkable. Even the monster at the climax of the original serial, which was just a glove puppet stuck through a photograph of Westminster Abbey's interior, is quite unsettling judging by the surviving photographs of the effect.