Gilligan's Island S02E30 - V for Vitamins

The castaways are starting to suffer from vitamin C deficiency. They are getting weaker as time goes by and Gilligan has the last orange. After the last orange shrivels and Gilligan is standing guard over the seeds he has a Jack and the Giant dream. Of note is, when the giant Skipper is chasing small Gilligan around the orange cases, small Gilligan is played by Bob Denver's son.