Lost in Space S01 E10 The Sky Is Falling

"A space colony family struggles to survive when their ship is hopelessly thrown off course."

The Robinsons can not understand the language of a visiting 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 Taurons end up not liking the planet and want to be alone, so they leave.