Barnum's life is one of spectacle and deception, and he was the creator of the famous three-ring Barnum & Bailey Circus. Before that, he was an impresario touring the circuit with various acts.
This one has been on Jackman's slate since at least 2009, when he hosted the 81st Academy Awards and worked with show producer Laurence Mark and former Sex And The City writer Jenny Bicks, who contributed material to the awards gala's script. Animation and special effects veteran Gracey was hired back in 2011.
There is no indication yet as to who Efron might be playing in the film, and it is still in negotiations stage, so he is not a definite part of it in any regards. Still, he has just worked with 20th Century Fox on Mike And Dave Need Wedding Dates, which arrives here on 12 August, and will also be seen in next year's Baywatch movie.