The animation is based on Judith Kerr’s book of the same name and will air as a festive special

Production is underway on seasonal animation Mog’s Bad Thing, to tx on C4 at Christmas.

The festive special is based on Judith Kerr’s picture book of the same name and is produced by Ruth Fielding and Camilla Deakin for Lupus Films, best-known for its animated adaptations of literary works, including Kensuke’s Kingdom, The Snowman and The Snowdog and The Tiger Who Came to Tea. Robin Shaw directs from Joanna Harrison’s screenplay.

London-based Serious Kids will be the worldwide distributor for theatrical and TV, outside the UK. The new film will have a theatrical premiere in the UK before Channel 4’s TV premiere at Christmas 2026 and will be paired with Mog’s Christmas in an exclusive deal done with a UK theatrical distributor (to be announced).

Gwawr Lloyd, interim head of drama C4 said: “We’re delighted to bring Mog back in another beautifully crafted adaptation from Lupus Films. Judith Kerr’s stories continue to resonate with audiences of all ages, and Mog’s Bad Thing captures the warmth, humour and gentle mischief that makes Mog so beloved.”

Created by author/illustrator Judith Kerr and based on her first family cat, the Mog series of books started with Mog the Forgetful Cat, which was first published in 1970 by HarperCollins Children’s Books and has never been out of print.

Mog went on to inspire a further 17 picture books in the series, selling more than four million copies worldwide and translated into 21 languages.