Originally posted by Duke
They could have JJ's son go out to space and accidentally bring back the symbiote to Earth with him, or just have an astroid strike the planet with the symbiote on it.
A cool idea, man, but I think you overlooked one tiny detail or two. Aside from the symbiote being able to sustain an unprotected entry into Earth's atmosphere while riding the aforementioned asteroid, but then the small matters of the actual impact, with the shockwave and it's intitial decimation and/or the resulting tsunamis, with heavy loss of human life resulting from just those two events. Then the nuclear winter aftermath, which would likely kill all or most life on Earth. That's a hell of a trip AND a risk for a parasitic creature that relies on a host for maximizing it's potential for strength and quality of life, doncha think?