Scream and Scream Again (1970)

In London, a serial-killer drains the blood of females and the Detective Superintendent Bellaver and his team are hunting down the so-called Vampire Killer. Meanwhile in an undefined country that lives a military dictatorship, the cruel Konratz is climbing positions killing The Power that Be. When the Vampire Killer flees from the police, he seeks refugee at the real estate of scientist Dr. Browning and jumps into a tank of acid. Dr. David Sorel is intrigued with the powerful acid and decides to get a sample. He finds the truth about the research of Dr. Browning.