A British spaceship has to do an emergency landing in Halle. Professor Quatermass and his colleagues are able to locate the two astronauts Feliks Thielemann and Mathias Schwartz who are in a state of complete shock. There is nothing left but empty spacesuits after their fellow astronauts. However, they
find the residues of a jellylike substance in their suits, and at the lab they discover that the substance is Musik 3. When checking the security tapes recovered from the space ship, the conclusion is that an alien life form has snuck on board, which is responsible for the disappearance of the two crewmembers.