The Electrical Life of Louis Wain stars Benedict Cumberbatch and Claire Foy are set to reunite in a children's classic adaptation coming to Channel 4. Based on Judith Kerr's iconic Mog picture books, Mog's Bad Thing will see Sherlock star Cumberbatch reprise his role as Mr Thomas opposite The Crown's Foy as Mrs Thomas.
The cast, who previously appeared together in Mog's Christmas, also includes Adjoa Andoh as the narrator, Amelie Law as Debbie, and Teddy Skelton as Nicky. A release date for the animated special has yet to be announced.
Newcomers to the cast include John Thomson as Mr Bunce, Katherine Parkinson as Mrs Ramsbottom, Mawaan Rizwan as Ali, and Amelia Theodorou as Amy.
Related: Best streaming services UK 2026 – including Disney Plus, Netflix, iPlayer and Apple TV
A synopsis, per Variety, reads: "The family are hosting a cat show in their garden which should be Mog’s chance to shine, but in all the excitement she does a 'bad thing' which means she hides in the attic feeling sorry for herself and misses the start of the show.
"Can Mog find a way to leave her hiding place, make her family proud and save the day?"
What to Read Next
Mog's Bad Thing will be directed by The Tiger Who Came to Tea's Robin Shaw and will be produced by Lupus Films.
Gwawr Lloyd, interim head of drama at Channel 4, said in a statement last year when the special was announced: "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 make Mog so beloved.
"Following the success of Mog’s Christmas on Channel 4, we’re excited to be working with such an exceptional creative team again to deliver another festive treat for families to enjoy together."
Ruth Fielding, co-founder and joint managing director at Lupus Films, added: "We are thrilled to have the opportunity to bring Mog’s funny feline adventures to the big and small screen once more.
"Following the success of our previous collaborations with Serious Kids on seasonal specials The Ghastly Ghoul and We’re Going on a Bear Hunt, we know that Mog’s Bad Thing is in safe hands, and we hope that Mipcom will result in a host of key pre-sales."
Mog's Bad Thing will air on Channel 4.
Visit our Streaming Guide now to see at a glance where you can view ALL your favourite shows and movies.
The new edition of Living Legends, celebrating the global phenomenon of BTS, is here! Buy this ultimate fan guide in newsagents or online.
