The Penguins of Madagascar is a spin-off of the Madagascar films, which takes place after the second movie. The series follows the adventures of four penguins: Skipper, Kowalski, Private and Rico, who perform various missions to protect their home in the Central Park Zoo. The penguins are constantly opposed by a trio of lemurs, Julien, Mort and Maurice, who believe that Julien is the rightful ruler of the zoo.
When Marlene screams in the night, the Penguins decide to investigate the noise. After Julien "scares" away the "ghost", it returns. The Penguins realize the "ghost" is an alligator named Roger screaming because of his fear of Marlene's snoring.