On its way back to Earth, the space shuttle Nautilus passes through a cloud of alien spores causing its sole occupant, astronaut Steve Thomas to transform into a blood-thirsty monster….

A private detective searching for a killer comes across a satanic cult from another dimension, monsters called up from hell and murderous ninja assassins.

After a lengthy space mission, two astronauts return to an Earth transformed by nuclear war. As renegade gangs and mutants rule Los Angeles, the astronauts join two pretty women and…