Immortality is a 2022 interactive film video game developed by Sam Barlow and published by Half Mermaid Productions.

The game is based on the fictional model turned actress Marissa Marcel (Manon Gage) who had starred in three movies from 1968, 1970, and 1999 but which were never released.

In the same manner as Barlow's prior works Her Story and Telling Lies, Immortality incorporates the use of full-motion video for the player to piece together Marcel's fate.

[3] The game is presented as a compilation of previously lost found footage of the filmography of actress Marissa Marcel as well as associated promotional and behind-the-scenes material.

The One becomes Marissa Marcel, a French girl who is implied to have been mortally wounded by German soldiers in World War II and absorbed by The One as a mercy.

In 1968 she auditions and is awarded a role in Ambrosio, a film based on the gothic novel The Monk by Matthew Lewis.

Two years later, John directs Minsky, a detective story set in New York City's avant-garde art world.

While filming a scene, Marissa shoots and kills Carl with a prop gun at point blank range.

To the rest of the cast and crew, this appears to be a tragic accident; the truth is that The One intentionally killed The Other due to the latter's growing resentment of The One's fascination with human creativity.

John, Marissa, and Amy begin work on a new film, Two of Everything, where pop star Maria allows her coincidentally-identical body double Heather to take her place at a billionaire's birthday party.

Amy plays the billionaire's wife who has Heather murdered, thinking she is Maria, to cover up an attempted rape by her husband.

[4][5] Barlow brought on three additional screenwriters for the game: Allan Scott, Amelia Gray, and Barry Gifford.

[2] In March 2022, Half Mermaid Productions announced that a version for Xbox Series X/S would also be available at launch.

[14][15] In an early review due to its print format, Edge awarded Immortality a perfect 10/10 score, the 24th game in its history to do so.

"[28] PJ O'Reilly of Pure Xbox said Gage "provides a core performance that marks her out as an absolute superstar in the making.