Blindpassasjer
Blindpassasjer (Eng. title: Marco Polo) was a Norwegian science fiction TV-series from 1978. It aired 3 episodes. 'Blindpassasjer' translates to 'Stowaway' in English, although its literal translation is 'Blind Passenger'.
A spaceship has 5 crew members. An alien kills one of the crew members which is replaced by a copy, but who is it?
Blindpassasjer is noteworthy for being the first science fiction series to air on Norwegian TV. It also has a plot that is conspicuously similar to Ridly Scott's film 'Alien' that came to cinemas the year after Blindpassasjer aired.