Sadly, you won’t be seeing Aquaman in any shape or form during Once Upon a Time in Hollywood, but Quentin Tarantino’s ninth movie does have a stacked cast. Along with Brad Pitt, Leonardo DiCaprio and Margot Robbie as the main stars, the lineup includes Kurt Russell, Timothy Olyphant, Dakota Fanning, Bruce Dern and Al Pacino, among many others.
Article source: https://www.cinemablend.com/news/2477024/that-time-aquaman-distracted-brad-pitt-and-quentin-tarantino-on-the-set-of-once-upon-a-time