The theory runs: “The Cars-verse includes a World War II–era Jeep named Sarge, who explicitly references events like the Battle of the Bulge. In the direct-to-DVD film Planes (made by Disney but not Pixar), there is an actual WWII flashback in which the plane Skipper recalls losing his entire squadron in the Pacific Theater. Assuming that Car WWII occurred, and that it contains the same contours as the actual WWII, we can assume that there were Car Axis powers, and thus a Car Hitler.”