There's no science objection to anything happening here (although a scientist from the 50's would have disagreed).
The only comment I'll make is that the pods, just like the Alien in Alien, could never have evolved on their own. They must have been created as a biological weapon by some very advanced technology, giving them the ability to adapt themselves to any sentient beings they come across.
The only thing I didn't like in terms of science was the opening segment. The alien filaments or spores or whatever float from the surface of a planet, into space and find their way to Earth in both a cheesy, bad effect (the only bad one in the movie) and a manner that demonstrates a complete lack of understanding of gravity in general and the distances between solar systems. It made me cringe.
The duplicates created by the pods in all three movies seem to be sort of bio-androids, which is fine. But they also have all the memories and knowledge of the people they duplicate.
I have to compliment this movie for showing tendrils extending into the heads of victims, implying some sort of brain download, rather than the implied telepathy of the original.
I do like the fact that they did away with the pods. In this movie the spores (very easy to believe as space traveling alien life) infect you and the next time you fall asleep they re-program your brain.
Plenty of precedents for something like this exist in nature. See PARASITE REX by Carl Zimmer.
Unlike the other movies, THE INVASION moved away from Jack Finney's pods and used the mechanism in Robin Cook's 1997 novel, INVASION, of an alien microbe that reprograms the mind and is passed from person to person by viral infection.
Robin Cook was given no credit for this, though his novel was a New York Times best seller and made into a miniseries in the same year. The screenplay for Cooke's novel was by Rockne S. O'Bannon (ALIEN NATION), and starred Luke Perry (BUFFY THE VAMPIRE SLAYER), Kim Cattrall (BIG TROUBLE IN LITTLE CHINA), and Rebecca Gayheart (SCREAM 2).
Yes, Cook's INVASION was a riff off of Finney's novel just like Scott Sigler's INFECTED was a riff off of Finney, Cook, and more besides. Still, if there was a nod somewhere to Cook in 2007's THE INVASION, I missed it.
But Could It Happen?
Here is the thing that all of these movies share: People noticing that their family and friends look exactly the same as always, and yet, are not the same person.
The scary part about that is, it is real.
People with Capgras syndrome visually recognize their loved one by sight, by sound, by touch, by memory (recall past history together - this is not a form of amnesia), and by emotion.
Their problem is, there is a physical disconnect in their brain between the part that processes vision and the part that processes emotion. As such they don't feel any emotional attachment to the person they are seeing, even though they know they have a strong emotional attachment to that person.
The ensuing feeling of Something is Not Right kicks in.
Somehow, some way, their loved one feels like a stranger.
Something's Not Right with this person who looks like my loving child but doesn't feel like my loving child.
Which makes the person with Capgras syndrome paranoid of their child.
However, Capgras Syndrome is only visual. For a person with Capgras, the communication between their hearing and emotional centers of the brain are undamaged.
For example, as long as a Parent suffering from Capgras syndrome cannot see their child but only hear them - say from another room - the emotional response and connection remains.
For more information on Capgras syndrome -
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