Julianne Nicholson didn't know Sinatra's fate when she first signed on to play the villain in Paradise. Creator Dan Fogelman likes to keep some mystery, even among the cast, so the actress didn't find out Sinatra was going to sacrifice herself until they started production on season two. Nicholson comments that Sinatra's goodbye, both literally and visually, is astounding. This revelation came in the season two finale, titled “Exodus,” before Sinatra stayed behind to destroy the bunker she helped create, dying in the process. Paradise answered season two's big looming question: Who is Alex?, revealing that “Alex” is a quantum computer designed to play with time. When Sinatra meets Doherty's character, who had gone by the nickname Link until now, she believes he is her son, who died in childhood, and that his existence is proof that Alex works.
“You have to believe in the story — and then go get your PhD in quantum physics and it will all make sense,” says Nicholson with a laugh. “But Samantha believes that Link/Dylan is her son, so that’s what I had to hold onto.” The co-stars share what the writers explained to them about the AI quantum computer named Alex that will steer Paradise into season three, now that Xavier, played by Sterling K. Brown, has been tasked with finding Alex and saving the world, while Nicholson shares how she's processing that moving goodbye to Sinatra after two seasons: “She kind of breaks my heart”.