... bar a few set-piece action scenes, this is mostly illogical, second-rate muck.

A slightly tired invasion.

Whenever the mothership starts whirring, or its mutant metallic spawn work their warlike mischief, it's quite a lot of fun.

It's so four-quadrant in its attempts to be both gritty and funny, romantic and action-packed, that it never gets to develop significantly in any particular direction.