Black Adam and Superman & Lois show that DC movies and TV shows are finally moving past an old restriction. Black Adam will see Dwayne Johnson's anti-hero re-awakened in the modern world after centuries of imprisonment, with his methods of fighting evil creating friction between him and the Justice Society of America. Black Adam arrives at a time when DC has re-organized its film and television history into a Multiverse of co-existing worlds, and one shared trait with Superman & Lois shows how that seems to finally be affording the freedom to each property that it should.
Among other elements, Black Adam will include the DC villain organization known as Intergang. Though their role in the movie is not entirely clear yet, Black Adam's use of Intergang will come just months before Superman & Lois seems set to do the same with its Bruno Mannheim reference during the appearance of John Diggle (David Ramsey) and set up for Intergang in Superman & Lois' season 2 finale. The timing of Intergang appearing in both Black Adam and Superman & Lois seemingly indicates that the old restriction of DC characters only being able be in one movie or TV show at a time is finally ending.
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As recently as the Arrowverse's heyday, Warner Bros. and DC were notoriously reticent about multiple versions of characters appearing across different live-action media. This restriction stopped things like the DCEU and the Arrowverse from simultaneously having their own versions of the Suicide Squad, or explained why Bruce Wayne never made a physical appearance on Smallville duringThe Dark Knight trilogy's run. There was the occasional exception to this rule, such as Superman Returns
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