Effective and quite creepy British SciFi has a drink driver knocking down a man in the middle of the road. He takes him to a local hospital where he is wearing a wierd rubber uniform and blood tests reveal he is not human. This attracts the attention of Dr Vernon (Judd) as well as two female aliens outside. The lead alien (Tani) tells his ship crashed taking two criminals to a prison planet but his story doesn’t quite ring true and it becomes apparent he is the criminal on the run. A force field is erected around the hospital causing tempatures to soar while Tani tries to escape his captors As always it’s made on a small budget but works well with more than a hint of Quatermass about it. Interestingly it’s written by Robert Holmes who go be script editor of the Pertwee era Doctor Who and some of the ideas here made into that periods stories..4/5