Indeed, Jim has hit prime-time TV playing a character that couldn't be further removed from the all singing, all dancing, all smiling sketches of Horrible Histories.
Instead, he's Aaron Mayfield, a convicted rapist who DI Alec Hardy (played by David Tennant) and DS Ellie Miller (Olivia Colman) are keeping a very close eye on as they continue to investigate the rape of Trish Winterman (Julie Hesmondhalgh).
Part five of the Series Three of the BAFTA-winning series - watched by over 10 million viewers - is on ITV at 9pm this evening.
"It's an honour and a thrill to play a part in such an outstanding show," said Jim, who agreed that his switch of roles had taken people somewhat by surprise.
"Some people on Twitter found it a bit hard to swallow that the guy from Horrible Histories is now playing a convicted rapist and of course I get that," he added. "They've grown up with me singing and dancing about, it's a huge shift, but, you know, I was always an actor first."
In a special interview this week, Jim has spoken about his love of Spurs, from going to bed wearing the Hummel kit of the 1980s and his first hero Paul Gascoigne to his first visit to the Lane - a visit that coincided with the first-ever National Lottery draw - right up to the present day and such exciting times for the Club.
On that first visit on November 19, 1994, Jim recalled: "It was against Villa in the 1994-95 season. We lost 3-4. Dean Saunders scored the winner in the 90th minute. I remember it was also the first-ever draw of the National Lottery. A major event.
"We raced back home to Bognor where the family was gathered at my Aunt's and got three numbers up, £10 off a day trip to Spurs! We may have lost but I loved it. I felt at home."
Look out for the full Q&A with Jim on Wednesday...