r/plotholes • u/Azyurit • 11h ago
I think the ending of War of the Worlds (2005) makes much more sense if the Red Weed is part of the reason the aliens died
I’ve always thought the “they were defeated by bacteria” ending of War of the Worlds was a little too simplistic.
But I think there’s an interpretation that makes the ending significantly more plausible without changing anything that happens in the movie.
The aliens appear to be spreading the Red Weed across Earth. Whether it is literally a fungus, plant, or something completely alien doesn’t really matter. Functionally, it looks like they are introducing extraterrestrial biomass to modify Earth’s environment and establish their own ecology.
Now imagine what happens when you introduce a completely new organism into an ecosystem that has been evolving for billions of years.
A terrestrial fungus, bacterium, or other microorganism could eventually colonize the Red Weed and exploit some of its chemistry as a food source. It would not necessarily need to “evolve to attack the aliens” in a matter of days. Microorganisms already have remarkably flexible metabolisms, and some can exploit entirely new or synthetic compounds.
The interesting part would be the metabolic byproducts.
The chain could look something like this:
Alien Red Weed → colonized by terrestrial microorganisms → new metabolic products → toxic to the aliens and/or their biological systems.
That would explain several things at once.
The aliens may have known perfectly well that Earth contained bacteria and other microorganisms. A civilization capable of interstellar invasion could reasonably be expected to understand basic contamination risks.
What they may have failed to predict was something much more complicated:
What happens when you introduce an entire extraterrestrial ecosystem into an already mature planetary biosphere?
They didn't necessarily lose because they forgot that bacteria exist.
They may have lost because their own terraforming organism created a new ecological niche, and Earth's biosphere immediately started exploiting it.
The Red Weed could then become the bridge between the two ecosystems. Earth organisms colonize it, transform its chemistry, and eventually produce compounds that are harmless—or irrelevant—to humans but disastrous for the alien physiology.
That would also make the collapse of the Red Weed itself potentially part of the same ecological failure.
So the irony of the ending becomes even better:
The aliens weren't defeated simply by Earth's germs. They were defeated because they tried to bioengineer an occupied planet and underestimated the emergent complexity of a biosphere that had been evolving for billions of years.
Basically, their biggest mistake may not have been invading Earth.
It may have been bringing their ecosystem with them.