The Celebrity Traitors, which was won by Alan Carr, was one of the biggest TV hits of 2025.
Mr Simpson, the owner of Plunge Creations in Portslade, East Sussex, created the chess props for one of the challenges.
He told BBC Radio Sussex: “The giant traitor which moves about on the chess board – this creepy, iconic character – was one of ours.
“I think it creeps people out. That’s what nightmares are made of.”
Mr Simpson and his team created the other giant chess pieces too, including the snake and the rat.
Speaking of the new series of The Traitors, which began on Thursday on BBC 1, he said: “We have had a hand in it.
I’ve come up with something for one of the games – but it’s all top secret.
“It was fun and a nice thing to build.
“You will know it when you see it. It will pop up and surprise you.”