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In September 2025, Siena was cast as a co-star in the highly anticipated film adaptation

of the New York Times bestselling novel ONE SECOND AFTER.

 

Directed by Scott Rogers, the apocalyptic thriller saw Siena filming on location in Bulgaria

for six weeks alongside an all-star ensemble including Josh Holloway

(Lost, Yellowstone, Mission: Impossible - Ghost Protocol),  Famke Janssen (X-Men, Taken, GoldenEye), Hannah John-Kamen (Thunderbolts, Ant-Man and the Wasp, Ready Player One),

Johnna Dias-Watson (Wednesday, Motörheads), Steven Ogg (The Walking Dead, Grand Theft Auto V),

Tristan Parks, and two-time Academy Award nominee Mary McDonnell. 

Principal photography Wrapped in November 2025.

 

The film was produced by Matt Kennedy of Startling Inc. (Game of Thrones, House of the

Dragon) & MPI Original Films (Motherland, Pinball: The Man Who Saved the Game).

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Safwan Azeem of collider.com recently ranked  ONE SECOND AFTER  the #1 as the most

exciting Sci-Fi Moves  Based on Books.

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​“Siena stepping into this project alongside such a remarkable cast and creative team is a huge moment,” said producer Matt Kennedy.

“Her work ethic, training, and dedication have truly paid off.”