Jason — the sequel is worth seeing even though Danny Boyle was not involved and it features a completely different cast. 28 Weeks Later is not as good as the original film, but at the very least it is very distinct from the original and explores a host of other themes (rather than just rehash). I’d liken it to the differences between Alien and Aliens (which isn’t too far off since 28 Weeks Later presents what would happen if the U.S. military arrived and tried to manage the quarantine).