Overview
Mission Stardust is a 1967 science fiction film based on the early novels of the popular German Perry Rhodan series by K.H. Scheer and Walter Ernsting.
Plot
In a quest to find a source of radioactive material more powerful than uranium, Major Perry Rhodan leads a four-man mission to the Moon on the rocketship Stardust.
On the Moon, they find a stranded Arkonide spaceship, where Commander Thora is trying to save a scientist named Crest, along with a crew of robots. The earthmen find that Crest is suffering from leukemia, for which there is a cure available on Earth. Perry and others take an Arkonide shuttlecraft to Earth to bring back a doctor with the cure.
One of the Earth crewmen is a traitor, however, supplying information to a crime lord who is after the radioactive material, but who sees the encounter with the Arkonides as providing an opportunity for an even greater prize. The crime lord arranges to replace the doctor and nurses with his own people, and upon arriving at the Arkonide ship they kidnap Thora in a bid to gain Arkonide technology.
From Wikipedia (CC BY-SA 4.0).