Dwayne Johnson clearly isn't a fan of keeping secrets. Black Adam doesn't open in theaters until this weekend, but DC fans are already buzzing about the film's Henry Cavill cameo, which Johnson has been talking pretty openly about since the premiere. Fans have been waiting to see Cavill's Superman back on the big screen, and Johnson went to great lengths to make sure the anticipated cameo took place in his movie, going over the head of the executive in charge of DC films in order to get the green light.