These aliens hid in a cloud their hideous deeds to enshroud They lopped off a head and brought back the dead while making a world scream out loud!
No, really. The cyclopean aliens kill by decapitation and use a radioactive cloud to reanimate the dead. Just watch The Crawling Eye (Quentin Lawrence, 1958). Look out, you've just crawled into Eyeball Week at Limerwrecks. Did you eyeball that segue?