Thing Three (3), will be introduced in the upcoming animated film The Cat in the Hat, scheduled for release on February 27, 2026.
The new Warner Bros. animated movie, which stars Bill Hader as the voice of the Cat, will expand on the original story by introducing a larger cast of "Things" beyond the familiar Thing 1 and Thing 2. The trailer specifically shows the introduction of Thing 1 and Thing 3, as well as many more (up to Thing 13).
The filmmakers have indicated that the movie will be set in a "Seussiverse" and will feature The Cat in the Hat on an assignment from a company called the "Institute for the Institution of Imagination and Inspiration, LLC" (I.I.I.I.), where the various "Things" are his co-workers.