sentinels

I keep killing them non-stop for over 30mins each time... but they dont die. I read something bout the 'veil of tears' but need more specifics plz

I'm looking for the name of this sci-fi special, I saw it on t.v and rented the DVD from the library around 5 years ago, it was a discovery special or something. It's all computer generated, there's two sentinels sent out into space, a blue and yellow one, they both hover and are looking for...

I'm looking for the name of this sci-fi special, I saw it on t.v and rented the DVD from the library around 5 years ago, it was a discovery special or something. It's all computer generated, there's two sentinels sent out into space, a blue and yellow one, they both hover and are looking for...