Swarm follows Dre (Fishback), a young woman obsessed with Ni'Jah, a Beyonce-like pop star with a militant fanbase.
The teaser shows Eilish's character, Eva, question Dre about seeing spilled milk on a carpet.
"What color was the milk?" Eva (Eilish) asks.
"It was red," Dre answers.
"Did you hurt someone?" Eva asks, prompting Dre to answer "Yes."
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"Very good," Eva concludes.
Nabers told Rolling Stone that casting director Carmen Cuba suggested Eilish for the role.
"She came in and their chemistry was really wonderful," Nabers said of Eilish and Fishback. "This show, in terms of women and violence, is so empowering for me, because you see it from such a masculine standpoint usually in the history of film and TV. To subvert that with this, and with Billie, was great."
Swarm premiered Friday on Prime Video.
Eilish is a singer-songwriter known for such singles as "Ocean Eyes," "When the Party's Over" and "Bad Guy." She released her second studio album, Happier Than Ever, in July 2021.
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