Playing like a "best of" reel cut from other films, Doomsday is not a particularly good movie, but it is a completely entertaining film. This is the film where writer/director Neil Marshall just cuts loose with all of the fun ideas that have been bubbling through his consciousness, filtered through films he has enjoyed, both new and old.
This is a film where greatness and originality do not appear to be among the final goals; rather it felt like he was trying to piece together all of those ideas into a single cohesive film. An experiment, if you will, in stream of consciousness and the ability to pull all of these ideas into a film. The end result? A film that tickles the pleasure centers in just such a way that you cannot help but be sucked along for a wild ride.
Doomsday brings in elements of a number of other films. Among the films referenced are Aliens, Escape from New York, Road Warrior, and 28 Days Later. I am sure there are more there waiting to be uncovered, but these are the most obvious. It is sort of a lower level, Quentin Tarantino-style homage film, but if he directed this it would have starred Uma Thurman and some older star needing a career resurgence, or at least some recognition (like John Travolta, Robert Forster, or David Carradine).
However, this is not a Tarantino film, it is a Marshall film, and that being the case, it has more of a B-movie feel that aims at being pure entertainment and nothing else. I watch Doomsday and do not get any overt attempts at sermonizing about the state of world affairs. Sure there are parallels that could be made, but I really didn't care; Marshall has created such a film that all that matters is what is on display.
As the film opens, we learn (via voiceover from Malcolm McDowell) that a virus appeared that began to decimate all in its path. It first appears in Scotland, so what do they do? Wall off Scotland, of course. There was never any serious attempt to discover a cure, just wall of the infected area and forget it. No one knows exactly what happened inside the wall, but eventually the visible fires went out and the area around the wall went quiet. With the outbreak apparently contained you would think that England would be okay, but that would be quite far from the truth.
Because of the way Scotland was treated, the world turned their back on England, leaving the country an economic wreck; poverty and overpopulation run rampant. Then the unthinkable happens — the virus returns. At the same time, it is revealed that there is still life within the wall, and where there is life, there is a cure. The plan is simple — send a covert military team into the hot zone to find and extract a cure, if one exists. To lead the team they enlist Eden Sinclair, a top agent in the defense force and one of the last to have made it out of the hot zone prior to the sealing of the wall (she was a child at the time).
So, off the team goes, tough-as-nails Sinclair at the head. They head to Glasgow, in search of the last scientist known to have been working on a potential cure. Rather than the good doctor, they find a band of gothic punks, not unlike the bad guys in Road Warrior (except played much more comedically). This precipitates a big fight, culminating in the discovery of a clue to the whereabouts of the doctor. This leads them into a medieval society, where they fight some more, which turns into an all out road chase with the punks from earlier. The climax is reached and plays for all of the bravado that this over the top, testosterone-driven spectacle deserves.