Or rather than a movie pitch, you could use this as the plot to an adventure, a backstory, or a campaign kickoff.
A new viral breaks out. It has a very slow incubation period, very few external symptoms, and requires personal contact to spread, so by the time it is detected it exists worldwide, and no one is sure how many people have it.
People who get it are largely immune to bacteria, fungus, parasites, and other viruses. Also, they can recognize each other by touch, and have a primal urge to care for and protect each other. They aren’t telepathic and don’t always agree on anything else (including the best way to protect and care for each other), but they do all feel “curing” them, or slowing the spread of the virus, is bad. And some “Spreaders” feel their best bet is to infect as many people as possible, so the number of them that want to protect each other goes up, even though that requires lots of close personal contact.
Meanwhile, governments of the world begin to realize Spreaders could mean the end of the existing global power structure. First they try to deny Spreaders have any benefits, then briefly hammer on the truth unknowns — will Spread mutate? What are the long-term effects? But quickly, it becomes a combination of clanism and competing narratives. Stories claim some Spreaders have begun attacking anyone not infected in zombie-like biting sprees, but no one knows if it’s true and, even if it is, how common it is or what provocations might be present. More believable reports claim in in 1 million people die slow, agonizing deaths if they catch the Spread, but even that can’t be proven to the masses one way or another.
Spread becomes a new global faction, growing through a dedicated outreach program of its members without any core leader, debatable ideology, or unified message. Spreaders claim universal infection would mean utopia. Ethical objectors say much too much is unknown about how Spread will impact humanity over generations, philosophers object to the biological compunction of it overriding free will, and uninfected people in power simply have no interest in losing their positions to a virus.
Can a compromise be found, or will humanity destroy itself because of an infection that makes it want to selflessly help itself?
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