Spy Cat (German: Marnie's Welt), also known by its German name Marnie's World, is a 2018 animated spy comedy film written and directed by brothers Christoph and Wolfgang Lauenstein. The film was loosely inspired by the German fairy tale Town Musicians of Bremen. It is an international co-production between Scopas Medien, Grid Animation, Philm CGI, SevenPictures Film GmbH, Schubert International Filmproduktions, UFA Fiction, Lauenstein & Lauenstein and Scope Pictures. The film was distributed in Germany by Universum Film, while Global Screen handles worldwide rights to the film and Viva Kids distributing the film in America.

The film is about Marnie, a tabby cat treated like a princess and getting everything she wants, as she becomes a "spy cat" and her friends Elvis the pitbull, Eggbert the rooster and Anton the donkey. Together, the four heroes try to go undercover by one of us and protect them along the way, they are to solve a special agent with bus riders, eating cakes, taking pictures and how to get the lead by the dangerous missions.