From :

IGN spoke to Joe Morton today, who plays Cyborg’s dad/”inventor” Dr. Silas Stone in Justice League. Morton confirmed that he worked on the reshoots with director Joss Whedon, and revealed that they changed the tone of Ray Fisher’s character, Cyborg. He also said that Warner Bros. wanted to “lighten up the film” with the reshoots because they felt it was too dark.

Read the Full Story