From the casting director's website: https://www.jessicashermancasting.com/backpack

Synopsis: A groundbreaking film in which one of the two main storylines delves into the intricate bond of two very different sisters, their familial ties are put to the ultimate test as they pursue divergent paths and missions.

[THIA/TESSA] – This casting is for a dual character, and describes both characters. Character identifies as female or non-binary, open ethnicity, mid 20s – mid 40s. Thia has spent most of her life in a laboratory and is now embarking on her first big adventure in the world. She is incredibly smart, witty, enthusiastic, and unflappable. She has an innate disregard for danger, not because she's fearless, but simply because she's naive. Strong comedy chops required. // The other sister, Tessa, has a militant intensity when it comes to achieving her family's goals and mission objectives. She will not let anything get in her way, not even her twin sister.

Physical Requirements: Must be comfortable training for heavy action/combat, must also be comfortable wearing prosthetics/heavy makeup, and MUST be 5'8" or shorter. LEAD