AllMovie

A few weeks ago, the space travelers were worried that the planet would freeze over; now, they're concerned that the blazing sun will kill them all. No one is more worried that the redoubtable Dr. Smith (Jonathan Harris), though he seems rather blasé about the plight of his companions when he uses all the available drinking water to take a shower. Later on, while foraging for food, Smith consumes an odd-looking fruit--which instantly transforms him into a giant 12 times his normal size! Unfortunately, the growth process has made Smith extremely paranoid, to the extent that he believes the only way to save himself is to wipe out the Robinson family!