On Halloween night, Ozzie and Thorny make plans to attend a non-costume party as Satan and a Scotsman. Meanwhile Ricky and David attend a Halloween Party at school and the Nelson household is besieged by children demanding candy – or else.
Ozzie quickly regrets advising David against allowing people to take advantage of his good nature.
Ozzie decides to diet so he can fit into a pair of size 38 pants.
David has a rival for the girl they fancy, and his name is Will Thornberry – his next door neighbor.