Saldaña’s initial idea of the film mostly included “Alita: Battle Angel,” some clicking noises, and a lot of gymnastics. On “The Tonight Show,” Saldaña described her struggle, “First, they told me that it was about this robot […] But it’s set in the jungle. And I was like, “Well that doesn’t really make any sense.’ A warrior princess [who] was a robot, a sentient — like, ‘What is that?’”