Similar to this are uh… tiberium, some kind of alien fungal infection or virus or bacteria that integrates with the biosphere in a parasitic/mutualistic way… and ice-nine.
You could also maybe have… what if a giant mass of whatever Odo from DS9 is actually made of… somehow crashes on Earth, or any planet… and then over the course of centuries or millenia… the meta material eventually segregates, escapes its pool… and slowly but surely acts as basically a plague of mimics, just getting better and better at assuming the forms of all biology on the planet, potentially massively disrupting the ecosystem before they become conscious and cognizant and sapient enough to realize what they’re doing.
Similar to this are uh… tiberium, some kind of alien fungal infection or virus or bacteria that integrates with the biosphere in a parasitic/mutualistic way… and ice-nine.
You could also maybe have… what if a giant mass of whatever Odo from DS9 is actually made of… somehow crashes on Earth, or any planet… and then over the course of centuries or millenia… the meta material eventually segregates, escapes its pool… and slowly but surely acts as basically a plague of mimics, just getting better and better at assuming the forms of all biology on the planet, potentially massively disrupting the ecosystem before they become conscious and cognizant and sapient enough to realize what they’re doing.