Jesper Johansson is the lazy and spoiled son of the Royal Postmaster General, who has enrolled Jesper into his postman training academy hoping that it will reform him. Jesper deliberately underperforms, forcing his father to finally send him to the distant island town of Smeerensburg with the task of posting six-thousand letters within a year. If Jesper fails, he will be cut off from the family's fortune. Upon arrival, it is explained to Jesper by sarcastic ferryman Mogens, and bitter teacher-turned-fishmonger Alva, that the town's two familial clans—the Ellingboes and the Krums—comprise nearly all of the populace and are perpetually at war, spending more time fighting each other than writing letters. While desperately searching for people to post letters, Jesper finds an isolated dwelling outside of town. There he meets a reclusive woodsman named Klaus, who has a house filled with handmade toys. Terrified by Klaus' imposing appearance, Jesper flees and leaves behind a sad drawing he had found from one of Smeerensburg’s children. Klaus forces Jesper to lead him to the house depicted in the drawing, and then makes Jesper secretly deliver a toy to the boy inside. Word of this event spreads to other children; they go to Jesper the next day, each believing that they will receive a toy if they send him a letter. Jesper capitalizes on the idea and asks Klaus if he can donate his toys; Klaus agrees provided that they operate at night, and that Jesper continues to deliver the toys in secret. Soon, more and more children begin writing letters to Klaus. When Jesper tells them that Klaus only gives toys to good children, and always knows when any child misbehaves, the acts of kindness they perform gradually inspire the rest of the townsfolk to end their ancient dispute. Alva reopens her school to help the children learn to read and write.
Jason Schwartzman as Jesper Johansson, a postman who befriends Klaus and helps bring much-needed happiness to Smeerensburg, while getting accustomed to a life outside of his comfort zone.
J. K. Simmons as Klaus (Santa Claus), an initially-reclusive woodsman who makes toys.
Simmons also voices Drill Sarge, the assistant head of the Johansson family's postal department who works under the Royal Postmaster General (uncredited).
Rashida Jones as Alva, a teacher turned fishmonger who becomes Jesper's love interest.
Neda Margrethe Labba as Márgu, a young Sami girl who becomes well-acquainted with Jesper despite their language barrier.
Joan Cusack as Mrs. Tammy Krum, the Krum Clan matriarch carrying on an ancient feud of her clan with the Ellingboes.
Will Sasso as Mr. Aksel Ellingboe, the Ellingboe Clan patriarch carrying on an ancient feud of his clan with the Krums.
Norm Macdonald as Mogens, the sarcastic ferryman of Smeerensburg who enjoys humor that comes at others' expense.
Sergio Pablos as:
Olaf Krum, Mrs. Krum's imposing son who does not speak, but communicates using inhuman sounds.
Pumpkin Ellingboe, Mr. Ellingboe's pampered, also imposing daughter whose only word is "mine", except when she says, "Right" when Mr. Askel Ellingboe plots to have Jesper and Klaus eliminated.
Reiulf Aleksandersen and Sara Margrethe Oksal as adult Sami voices.
Sam McMurray (uncredited) as The Postmaster General, Jesper's father, and The Headmaster of The Royal Post Academy, who sends Jesper to Smeerensburg.
Klaus is a 2019 Spanish-American animated Christmas film written and directed by Sergio Pablos in his directorial debut, produced by his company Sergio Pablos Animation Studios and distributed by Netflix. Co-written by Zach Lewis and Jim Mahoney, and co-directed by Carlos Martinez Lopez, the traditionally animated film stars the voices of Jason Schwartzman, J. K. Simmons, Rashida Jones, Will Sasso, Neda Margrethe Labba, Sergio Pablos, Norm Macdonald, and Joan Cusack. Serving as an alternate origin story of Santa Claus independent from the historical take of Saint Nicholas of Myra and using a fictional 19th-century setting, the plot revolves around a postman stationed in an island town to the Far North who befriends a reclusive toymaker (Klaus). The film was nominated for an Oscar.
Klaus was released on 8 November 2019 and received positive reviews for its animation, story, and vocal performances. It won seven awards at the 47th Annie Awards, including Best Animated Feature, and also won Best Animated Film at the 73rd British Academy Film Awards. The film was also nominated at the 92nd Academy Awards for Best Animated Feature, making it the first animated film from Netflix to be nominated for an Academy Award, as well as the first animated film from a streaming service to be nominated, alongside I Lost My Body, but lost to Toy Story 4.