"Kingdom Come" is the 13th episode of season 1 from The Penguins of Madagascar.
King Julien is taken to the hospital after showing strange behaviour, so Maurice is left in charge. But Maurice soon develops the same behaviour, and begins to rule the zoo with an iron fist. Its up to the penguins and King Julien to stop Maurice before he takes over the zoo then New York.
The penguins think they hear a hyena, which turns out to be Julien, who is being taken to the hospital, leaving the lemurs without a king. Skipper convinces Maurice to be king, until Julien returns, but Maurice insists that "Julien will always be our one and only king". Maurice goes crazy after eating Julien's lychee nuts, demanding the loyalty of all of the animals in the zoo. After initially thinking this is just a joke, Skipper realizes that he is serious and formulates a plan to wrest control from Maurice after he shuts down the power and water to the zoo habitats, but get captured in the process. After fighting Maurice's two gorilla bodyguards, Bada and Bing, in an unsuccessful attempt to wrest control from Maurice, the penguins seek out Julien at the hospital. They find that Julien was sent crazy by bad nuts but a guava juice given to him counteracted the effects of the nuts. With Julien, the penguins try to regain control by spraying Maurice with an aerosolized version of the drink. Julien is knocked out before he can spray Maurice but Mort manages to spray him and save the day. After Maurice recovers, the lemurs play cards with the penguins, while Mort eats some of the bad nuts and his eyes turn red.