 The second serial "Quatermass II" (1955) is the earliest BBC science fiction production to exist in its entirety.Kneale could not rely on sophisticated special effects to convey his narratives.Instead, he based his stories around characterisation and characters' reactions to the strange events unfolding around them, using science fiction themes to tell allegorical stories such as paralleling real life racial tensions with the Martian "infection" of "Quatermass and the Pit" (1958–59).