First Contact?

Radio signals begin flooding Earth from the vicinity of Uranus and two ships, each with a crew of four are sent to investigate. The signals are traced to an alien spaceship on Ariel, one of the moons of Uranus. The ships land and all but two enter the alien vessel to converse with the apparently friendly humanoid alien, Vari. One of the two remaining crewmen believe the alien to be malevolent and determines to destroy it...