Several novelizations of each of the six films and some comic books as well as original canonical novels based on the franchise have been released. The original novels include "", "Alien: Sea of Sorrows", "Alien: River of Pain", marketed as the "Canonical "Alien" Trilogy" and the short story collection "Aliens: Bug Hunt". "Out of the Shadows" and "River of Pain" were adapted into audio dramas in 2016 and 2017 respectively released on the Alien Day of the respective year. Alan Dean Foster published "Alien: Covenant – Origins", a novel set between the events of "Prometheus" and "Alien: Covenant".