Rotting corpses, with bulging eyes and peeling flesh have been making their merry way around London landmarks on Saturday, terrifying tourists and creeping out commuters.
In convincing costumes, hundreds of Londoners have lurched around the capital, on a tour past Marble Arch, Oxford Street, Piccadilly Circus and Leicester Square.
World Zombie Day is an international annual event that grew from Pittsburgh's first Zombie Walk at Monroeville Mall in 2006, the site where George Romero filmed Dawn of the Dead - to help all fans of Zombie culture come together in an international effort to relieve hunger and homelessness.
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Participants in London will make donations to St Mungos.
More than 50 cities worldwide participate in World Zombie Day, including New York, Pittsburgh, Paris, Hong Kong, Los Angeles, Chicago, Dallas, Seattle, and Tokyo