Dwayne Johnson has opened up about refusing to allow ‘Black Adam’ a cameo in Shazam! 2 and how he pushed for a separate film for the character instead.In a new interview with Vanity Fair, Johnson explained why he wanted Black Adam to have his own film rather than be introduced in Shazam!, explaining that he felt it would do the character a “disservice”.He explained: “When the first draft of the movie came to us, it was a combination of Black Adam and Shazam: two origin stories in one movie. Now that was the goal – so it wasn’t a complete surprise.