"You don't see us, now you do. But only if we want you to."
Thimbletack is the main supporting protagonist from The Spiderwick Chronicles.
Thimbletack is a loyal friend to Arthur Spiderwick and the Grace children. He warns them about the perils of the Fairie world and helps them with their mission. However, if he gets mad or betrayed, Thimbletack, like any house brownie, can turn into a boggart and make messes. If he is appeared, he can calm down and shrink back into a brownie.
- In the film adaptation, he is voiced by Martin Short, who also played B.E.N. in Treasure Planet and Stefano in Madagascar 3: Europe's Most Wanted.