I'll foil that plan by catching the thing/facehugger breed in a big metal box. I'll then send the box to mars to save mankind from the 'Ghost on Mars' abomination.

Meanwhile, I'll carefully capture any women who have been impregnated from the halfbreed. Ignoring everything we know about genetics, I'll pretend that the parasite has been carried in the women's genes and clone her, assuming that any half-alien monsters I create in this way will be safely controllable just cos I've engineered them.