After initially resisting it, Warner Bros. finally caved to the Marvel trend and started including bonus scenes during and after the credits of a lot of its movies based on DC Comics. These things tend to exist to tease future movies in a franchise, and that’s exactly what DC is doing with them as it rebuilds the DC Extended Universe after the “Justice League” disaster.
And “Shazam,” which isn’t just a delightful superhero movie but is also a delightful Christmas holidays movie, definitely has an eye toward the future of the DC Comics movie universe, with a huge hint about where things are going revealed in its mid-credits scene.