King Julien is a major character of the Madagascar franchise. He is a minor character of Madagascar, a supporting character of its sequels, Escape 2 Africa, Europe's Most Wanted and South American Getaway, the anti-heroic secondary character of The Penguins of Madagascar, the titular main character of All Hail King Julien, the spin-off film of the same name, and its sequel and a minor character of the spin-off film, Penguins of Madagascar.
All Hail King Julien
In the film, Prince Julien was Uncle King Julien's grandson who defended his lemur colony from any fossa attacks. But after his uncle's death, Prince Julien became king of the lemurs and now has an entire kingdom of lemurs to lead on his own. at the half end of the film, He saves his subjects from the Fossa (although he got bitten on the rear by one and survived). After Fang's demise. Julien gives a speech to the lemurs "From this moment forth, no lemur will be harmed outside the kingdom, again!"
In the Series, a bamboo lemur named Clemson tricks Julien XIII into going into the Fossa territory to find out what they're planning with Maurice joining him. In the end, Julien discovered Clemson's plot, glad that Clover chose him over Clemson, and gives him a second chance, by putting him in the Fossa disguise, that is being cuddled by a Fossa girl, much to Clemson's dismay.
the day, Alex and his friends arrive in Madagascar, King Julien and his people were enjoying one of their raves until the fossa, the lemur's worst enemies, attack. Hidden in the vegetation, the lemurs watch as the carnivores panic and ran away, due to Alex, freaking out over a spider on his back. thinking that Alex and his friends were giants from some faraway land, Julien comes forward and proudly presenting himself as the King of the lemurs.
That night, the lemurs make a meeting in a plane crashed into the tallest tree in the jungle, with some human skeletons still inside (presumably Amelia). Realizing how much the Fossa feared Alex, Julien proposes to befriend the lion, so that the fossa will never approach and kill them anymore. However, his advisor, Maurice is skeptical about this plan as he suspects that Alex could be more dangerous than the Fossa, but Julien insists that his plan, being his, is infallible.
The lemurs welcome Alex and his friends with a party and King Julien rejoices at how well his plan goes, although he does not like it when Alex is called king, not knowing that it is a simple nickname ("the King of New York"). His plan fails when Alex started to go out of control and try to kill everyone, including Marty, as his main target for food. Thinking that Alex is more dangerous than the foosa, Julien tells Marty, Melman and Gloria that Alex found his hunting instincts and states that it's his fault, too.
Later, He and Maurice regain their respect for Alex for finally defeating the foosa and chasing them away, (due to a performance, staged by him, his friends and the penguins). On the beach, As the Zoosters prepare to return to New York, The king gives Alex his crown in a token of gratitude for bringing peace to his kingdom, stating that he has a new and larger crown, this time with a leaf tailed gecko.
Julien and his subjects are celebrating a holiday called "Julianuary" and are throwing rocks at a strange creature in the sky. When Alex makes a direct shot, the creature is revealed to be Santa Claus and Julien takes him in as his guest to celebrate Julianuary. While Alex, Marty, Melman, Gloria and the penguins deliver the gifts for Santa, Julien sees Santa giving toys to the other lemurs, which Julien takes away out of pure stinginess. However, Santa shows Julien how wonderful generosity is and Julien starts giving away presents to his people.
Julien and Maurice accompany Alex, Marty, Gloria, and Melman to New York on the plane, built by the Penguins. He's in the 1st class, ordering constant refreshments, and amusing himself with plane crash videos. As the plane crashes down to Africa after running out of fuel and momentum, Julien takes utter pleasure in the feeling of weightlessness, caused by the high speed descent. By being in 1st class, King Julien escapes the crash with a parachute.
Upon arriving in Africa, King Julien at first believes that they're back in New York, and he makes himself a new crown. Later, when the reserve watering hole dries up, Julien suggests that they make a sacrifice to "his good friends, the Water Gods" at the volcano to replenish the water. At first, Julien suggests Melman as the sacrifice (who believed that he was going to die soon anyway). But after Melman realized that he was actually going to live after all and that Gloria returned his feelings, he gave up on being a sacrifice, leaving King Julien disappointed at his plan's failure. But Mort, who had been following the two, arrives soon after, followed by a persistent shark that had been trying to eat him. The shark then falls into the volcano, and as the lemurs come out of the volcano, he sees the water coming back to the reserve (because of a dam, constructed by Nana being destroyed by Alex and Zuba), and he's convinced of his plan's success. in the end, the lemurs stay in the reserve with Alex, Marty, Gloria and Melman while the penguins and chimps leave for Monte Carlo.
The Penguins of Madagascar
In the episode, "Crown Fools", King Julien panics when he loses his crown and obsessively longs for it, until it is revealed that he had a spare crown all along, prompting Marlene (who was trying to make Julien new crowns all day) to chase King Julien with a crowbar.
When the sewer rats went to the zoo and tricked the Penguins out of their home, King Julien decided to play for the Penguins in a game of Hockey to try and win their home back. They were losing until one of the rats touched Julien's feet, after which he lost it and beat all of them on his own.
In the episode, "Haunted Habitat," King Julien mentioned that he had a dream that he was "the last mammal on Earth." Mort was just happy to be in the dream (despite that he was "roadkill" in it).
In "Misfortune Cookie," Rico gets a fortune cookie, that reads, "You will soon meet a fowl end." The Penguins deny that fortune cookies have any power (despite getting 3 accurate fortunes), and dismiss it as superstition. King Julien exclaims that "these stitions are super," and attempts to get the Penguins to believe in the supernatural. King Julien actively plots to make a "fowl end" fortune come true—by his own doing.
A recurring gag in The Penguins of Madagascar series is King Julien's behavior and believing in supernatural beings and superstitions, which often annoy the other animals.
It is also shown that King Julien gains a super-lemur level of strength if he gets mad. Visible when in "Miracle On Ice," King Julien spanked and humiliated the Rat King, after one of his henchmen touched Julien's feet; in "Happy King Julien Day," Maurice claims that King Julien violently used a cane to spank everyone who forgot his self-proclaimed holiday.
In "Dr. Blowhole's Revenge," it's revealed that King Julien is a double agent for the Penguins and Blowhole.
After spending a year in Africa, King Julien, Mort, and Maurice go with the crew to Europe to get the penguins and the chimps. While the Zoosters get the chimps and the penguins, he is ready to flip the switch for the main power when Maurice gives the signal and Mort holding the clock. He presses it, shutting the power down. When they attract unwanted attention from the public, Chantel DuBois pursues them while Gloria, Melman, Marty, Alex, the penguins, the chimps, and the lemurs go on a high-speed chase in a Luxury Assult Recreational Vehicle (L.A.R.V.). King Julien pops open the door and thinks he's famous and calls them "Paparazzi", gleefully telling them not to take his picture. He is hit with a tranquilizer dart.
The vehicle falls with King Julien while the rest are scared. The exception is Maurice, who looks surprisingly hopeful. However, the penguins' monkey plane saves Julien's life (to Maurice's disappointment). When DuBois catches up to them, Julien has Mort distract DuBois while Alex sends her into a pool on top of a building. About a couple hours later, the plane crashes again, but this time, into some railroad tracks. Julien is dizzy from the crash, so Mort and Maurice carry him while he regains consciousness. The gang then finds a circus train. When they won't let them on, they lie that they are circus animals and they let them on the train. Skipper then purchases the circus as a means of getting home.
The next day, Julien, who has recovered from his dizzyness, meets a circus bear named, "Sonya" and falls in love with her. They go on a romantic tour around Rome, and they go to Vatican City where Julien stands in line to kiss the Pope's ring. When he kisses the ring, he secretly puts it in his mouth and places it on Sonya's finger. When her tricycle is broken on the steps of the Vatican, he buys her a motorcycle instead of the pope's ring because he can't bear to see her unhappy. They go on a fun joyride and decide to do donuts at the Pantheon. When they get back to the circus, they realize that the show flopped. While running from the audience, Julien tells the chimps to throw the money to them, but they accidentally toss it to the audience.
After the show is reinvented, Julien and Sonya perform as an acrobatic duo on Sonya's motorbike in the circus. When the circus arrives in New York and the animals are exposed, he joins the Zoosters with Maurice and Mort, after a heated breakup with Sonya. The Zoosters and lemurs arrive at the zoo, but they realize it's not what they remembered after all. Seeing that they would rather be free in the real world then trapped in a zoo, they decide to go back to the circus. But before they can go back, they are tranquilized by DuBois and her men. Luckily, Julien, Maurice and Mort escape and returns to the circus animals, who realize the Zoosters are in danger. That night, they all arrive at the zoo and manage to save Alex and the gang. Julien and Sonya use their motorcycle act to knock out DuBois into a reptile exhibit. In the end, Julien resigns as king, so he can be with Sonya.
Julien finds a potion and thinks he makes anyone be irresistible, King Julien cheats animals with a trick in which Maurice was dressed as a woman and was in love with Mort with potion. Later, the potion wears off and he asks for penguins redo it after Julien cheats Alex creating a lotion that unintentionally humiliates Alex, in the end, he created another potion that just by eliminating his fur.
Penguins of Madagascar
King Julien appears in the mid-credits scene where he assist the penguins when they successfully try to change Private back to his normal form using Mort as a cute alimentation. Mort initially seem to not have any consequences from the ray until he swallows King Julien alive.
It's currently unknown what happened to Julien after this, but he probably got spited out by Mort once he came back to his normal self.
King Julien has a supporting role in the fourth film. He goes with the gang after saying goodbye to Sonya and becomes king again, to Rio de Janerio before crash landing on the South Troops' plane, and appears in every scenes. One of them is when he is on the lookout along with Maurice and Mort. And also appears in another scene where Mr. Drake Begum pursues them while Alex, Marty, Melman, Gloria, The penguins, the lemurs, the chimpanzees, Gia, Vitaly and Stefano go on a high speed chase in a Assault School Bus (A.S.B).
The gang surrounded by Begum's marmosets in the alley by a broken bus. But soon is being saved by the South Troops. Later in the movie, Julien needs to up the new act for pizzazz, and also makes himself a new crown, declaring himself king. So then, Julien, Maurice and Mort are hosting while the animals are performing their acts, but it turns out horrible. So they put up Theo and he has a perfect new act, so Julien will grants him with a pumpkin as an award (which makes it an orange melon). King Julien and the other animals went to Melman and Gloria's anniversary party.
They connecting together, performing as they doing their dance with several bamboo lemurs in the talent show in the Amazon. When the zoo animals feeling messed up to the other animals and set things right on the old boat, the lemurs go with the Zoo animals, but Julien is shot with the dart. With him unconscious and not being one of the Zoo animals, Maurice and Mort goes down to the plane with the other animals where the penguins and the chimps able to fix, who realize the Zoo animals are in danger as a result.
In the end of the film, Julien had himself a habitat along with Maurice and Mort, then dance and celebrate at the Central Park Zoo with his friends.