The production did not want to throw away the film material of the first pilot of the series and cleverly turned it into an episode where to justify the absence of Dr. Smith in the scenes of The Robinsons, they made him refuse to travel with them and stay with the robot in the Jupiter II. The story is full of adventures and shows the adventures of the Robinsons when, escaping from an approaching polar wave, they head aboard the chariot to the south of the planet, first crossing a frozen river but later, when passing through a climate of extreme heat, they must return. To the ship crossing this time through the turbulent waters of the river that has thawed. Because this episode is edited with scenes from the unaired pilot to which new scenes were added, continuity errors are perceived several times, for example after the temperature rises to extreme heat and the family has taken off their coats, On their return to the ship they are seen again with their parkas on. A brief scene from the episode Island In The Sky is also repeated where Dr. Smith sees the Robinsons return safely through a hatch in the ship. When Smith was already wearing his final uniform, we see him again with the Robinsons' overalls. First episodes.