Lyle the crocodile becomes so jealous of Joshua's birthday party and presents that it makes him feel ill, and he ends up in the hospital, where he recovers his good nature by entertaining the children there.
Lyle the Crocodile leaves his happy home on East 88th Street with the Primms to go in search of his mother at the urging of his former employer Hector P. Valenti, star of stage and screen.
A young crocodile swallows everything from a can of baby powder to his father's hat until the day he helps his mother tidy up the house with the vacuum cleaner.