Perdus dans L'Espace s01e10
Titre original : The Sky is Falling
The Robinsons can not understand the language of a visitig family also on the planet. The aliens are called Taurons, and come to use the planet as a new colony. However Dr Smith causes problems between the two camps when he panics and draws a gun on the new family. The Tauron's end up not liking the planet and want to be alone, so they leave.