With director Todd Phillips' standalone Joker film set to be released later this year, longtime fans of the character are likely excited to see what this new cinematic story starring the Clown Prince of Crime will have in store. True to the Joker's unpredictable nature, however, the final product may differ significantly from what was originally laid out.Deadpool 2 alum Zazie Beetz, who will play the character of Sophie Dumond in the Joker's first solo big screen outing, told MTV News that much of the film's script was rewritten in the midst of production.RELATED: RUMOR: Joker Contains 'Pointed Commentary on Donald Trump

"[The] script was great," Beetz said. "We rewrote the whole thing while we were shooting it. Literally, we would go into Todd's trailer and write the scene for the night and then do it."

Beetz then clarified that the film's original screenwriter Scott Silver "was there too" and "was helping out."

"During hair and makeup we'd memorize those lines and then do them, and then we'd reshoot that three weeks later," she continued. "We had to do everything then because Joaquin [Phoenix] had lost so much weight that we couldn't do reshoots later on. So, we were figuring it out. But Todd's quick at getting stuff done so we always had extra time, which was great."

RELATED: Joker Director Confirms Production Wrap

Directed and co-written by Todd Phillips, Joker stars Joaquin Phoenix as the titular character along with Robert De Niro, Marc Maron, Zazie Beetz, Frances Conroy, Brett Cullen and Bill Camp. It is scheduled to be released on October 4, 2019.