The book bridges the gap between the original film and its sequel film, 28 Weeks Later.

In 2010, Shebib announced that a sequel film was in production.

The following October, the studio officially announced the production of the sequel film, whose premise would be kept under wraps.

The brothers' dilemmas are later resolved in similarly titled sequel films.

The series ran from 1972-1981, and resulted in six sequel films.

Some of this music was used again in Peter Hyams's 1984 sequel film, 2010.

After the book was published in 1995, production on the sequel film began in September 1996.

It was reported in April 2009 that funding had been secured for a sequel film.

Additionally, she appears in Bloch's sequel novel and the unrelated sequel film of the same name.