A stoner - who is in fact a government agent - is marked as a liability and targeted for extermination. But he's too well-trained and too high for them to handle.

[from trailer]
Mike Howell: I just killed two people!
Phoebe: That's awesome.
Mike Howell: They had guns and knives and they were being total dicks!
[from trailer]
Mike Howell: Something very weird is happening to me: I keep killing people! There's a chance I may be... a robot!
[from trailer]
Mike Howell: I'm going to save my girlfriend!
[from trailer]
Adrian Yates: This guy is a trained killer! We made him! He's a security risk!