Jason Momoa joined the franchise as Dante, the son of "Fast Five" antagonist Hernan Reyes and the villain seeking revenge in "Fast X."
In the end-credits scene, over the phone, Dante warned Johnson that he'd face consequences for killing his father.
"You took the most important thing in my life from me," Dante said. "Dom drove the car, but you? You pulled the trigger and now I'm gonna make you suffer."
"Fast X" director Louis Leterrier told The Hollywood Reporter that it was a team effort to get Johnson on board.
"I didn't know Dwayne, personally, but we reached out to Dwayne and Dwayne's team," he explained. "We sort of looked at each other from across the room and winked a few months back, saying, 'We should work together.' And then I had this idea and I presented it to the producers and the studio."
He continued: "And then we reached out to Dwayne and his team and said, 'Just come and watch the movie. You have to love the movie first.' So he came to see the movie and really loved it, and then we started talking."
Diesel also told THR in a separate interview that conversations regarding the returns of Johnson and Gal Gadot as Gisele "have been going on for a while."
"The conversations are what makes the best movie? What feels right for a franchise? How do you make as many people happy in this world? And both of them clearly make people happy," Diesel said.