Ep 16. Target: Earth

Doctor Smith detaches the robot's tracks from his torso, and accidentally launches them and the space pod towards a nearby planet. The aliens there invite the Robinsons to retrieve their missing pod. After they land, Doctor Smith encounters one of the aliens, who looks much like a melted candle with eyes. Smith reveals that humans all look different, prompting one of the aliens, Gitt Proto, to hatch a scheme to capture the Robinsons and replace them with reshaped aliens! They'll then take the Jupiter 2 back to Earth to learn enough to conquer it! Will and Smith evade capture and sneak aboard, but it's still two against five! Fortunately, Will realizes something about the aliens that gives him an edge...