"28 Weeks Later" is known for its intense and disturbing content, featuring graphic violence, horror elements, and themes of survival in a post-apocalyptic world. The film portrays the aftermath of a viral outbreak that turns people into rage-fueled zombies, leading to harrowing scenes of chaos and death. The atmosphere is tense, with a focus on the psychological impact of the situation on characters. Overall, it's considered one of the more disturbing entries in the zombie genre, appealing to viewers who appreciate horror and suspense.

Cillian Murphy did not appear in "28 Weeks Later" because the sequel takes place several months after the events of the first film, "28 Days Later," which focused on his character, Jim. The story shifts to a new set of characters and the aftermath of the outbreak in a quarantined London, exploring the impact of the virus on society. As a result, the filmmakers opted to focus on a different narrative rather than continuing Jim's story. Murphy's absence allowed for new themes and character dynamics to be developed in the sequel.

No, "28 Years Later" is not an official sequel to "28 Weeks Later." While "28 Weeks Later" is the direct sequel to "28 Days Later," "28 Years Later" is a concept that has been discussed but has not materialized into a film. As of now, no sequel titled "28 Years Later" has been produced or released. The franchise remains focused on the first two films, with "28 Days Later" and "28 Weeks Later" being the established entries.

In "28 Weeks Later," the twist occurs when it is revealed that the infection can be transmitted through the blood of infected individuals, even after apparent recovery. The character of Andy, who is initially thought to be safe, becomes a carrier of the virus after being bitten. This twist highlights the unpredictability of the infection and the fragility of the perceived safety in the quarantine zone. The film ultimately underscores the theme that the threat of the virus is not entirely eradicated, leading to a devastating conclusion.