I’ll throw in two more taglines:
[b]Becoming human was not part of the plan. Now they want to terminate him.
He can’t be kept a secret any longer…[/b]
TBH, I’m not sure anyone will get this one.
That’s D.A.R.Y.L.
ETA: Yep. I checked and I’m right. I love that film.
Here ya go:
Man is The Warmest Place to Hide.
Dagnabit. I thought it would be harder. Yeah, I think that movie was underrated.
Invasion of the Body Snatchers?
no clue
John Carpenter’s The Thing?
I checked IMDB after posting and I am correct. Ok, this should be pretty easy:
This time there’s more
Edit: I am going to bed. Please check your answer after you post it here. To the first person who gets it, please self-launch your new tagline as I will be unable to confirm your correct answer from the depths of slumber.
Aliens.
I say we nuke it from orbit, it’s the only way to be sure.
Gremlins (2)?
Yeppers! Gryper mostly comes out at night. Mostly…
Not really, I usually start to crash around 10 p.m. 
There Is No Gene For The Human Spirit.
That would be A.I
No, sorry.
Pah - I was so certain - Gattaca? ohh… or I, robot?
I’m probably going to smack myself as it seems so familar…I’m trying to think of DNA/or robot as human type films as it has that vibe.
It is Gattaca! Well done!
I’m at work, so I’ll post one as soon as I get home (in approx 4 hrs)
4 hours?! Are you clockblocking us?
Patience young padawan!
Seriously, how often do I get a chance to roll out “clockblocking”? 
Hey I’m back (not the tagline)
Tagline:
You don’t need a driver’s license to reach the stars
Explorers?! I’ll keep guessing until it’s right.
That’s gotta be it.
ETA: That’s it. You’re up, Thunder.