Song writer Mark Devereaux accidentally calls millions of green Martians to invade Earth. No they aren't dangerous, just wise-cracking, intrusive, pain in neck, annoyances. No one can escape their distracting influence. It's up to Mark to figure out how they got here, and most importantly, how to get rid of them before they drive everyone crazy!

Morgan and his friends are on a hunting trip on a remote Canadian island when they are attacked by a swarm of giant wasps. Looking for help, Morgan stumbles across a barn inhabited by an enormous killer chicken. After doing some exploring, they discover the entire island is crawling with animals that have somehow grown to giant size. The most dangerous of all of these, however, are the rats, who are mobilizing to do battle with the human intruders.

Colonel Reynolds and his group of government scientists continue their work on re-animating the dead for military use. His son Curt and his girlfriend Julie use Dad's security pass to sneak in and watch the proceedings. Later when father and son have a disagreement, Curt and Julie take off on a motorcycle and Julie is killed in an accident. Grief-stricken, Curt takes her body to the lab and brings her back to life. Curt must help Julie deal with her new existence as military agents and local gang members try to find them.