Dwayne Johnson was the brains behind the superhero Shazam .
The film went into pre-production in 2009 with director Peter Segal and writer John August , and Dwayne Johnson considered to star as the villain Black Adam , but the project fell through ; Johnson thought of a movie idea and he came up with a super hero called Shazam as an executive producer on Shazam ! .
Shazam! -LRB-film-RRB-