The cast and crew interviewees in the "Making Of" attached to this DVD pointedly reference John Carpenter's "The Thing" in relation to how they see their own little movie. Now, while it's admirable to aim for the gold standard of that classic, the comparison also runs the risk of alerting the viewer that "Alien Raiders" is little more than a few borrowed ideas rattling around until feature length is reached. It passes the time enjoyably enough; the cast are mostly good and the late night supermarket setting is well drawn. But as good as the borrowed ideas are, the film has no idea how to resolve them, and the final "twist" borders on being insulting to the even semi-conscious viewer's intelligence.
There are aliens among us, living inside human hosts. And, in a nod to another John Carpenter movie, only some people can see them. So we get the "who is/isn't an alien?" scenario played out to initially interesting effect. But the whole alien thing is basically a mcguffin to get the plot rolling rather than a theme the filmmakers are interested in exploring or in having some fun of their own with. The action scenes are quite muddled, with lots of fast cutting and jerky camera moves; there's lots of blood splashing around but that same camera trickery is deployed to minimise what we see of some slightly less-than-special prosthetic and creature effects.
Yes, it's a low budget movie. But that shouldn't have mitigated against the script being better developed and the characters being more memorably sketched in. The story might have been better and more tautly told as an hour-long episode of something like "The Outer Limits". As it is, this one's a painless watch, but you'll probably feel cheated if you pay anything like full price for it.