so we have

Questions: Remember from each answer you want the first letter of the Movie title.

1.."zero taction contact" "don't touch"
Saturn 3

2.."what does this remind me of, oh yes David and Goliath, only this time David is overmatched"

3.."we helped Proffesor Barnard with his sums"
The Day the Earth Stood Still

4.."how many?" "Uh, all of them i think"
Terminator 2

5.."I knew it must be one of the prime numbers in the Zenus series. I haven't changed"
Flash Gordon

And number two is a disney science fiction film.