***Amusing Big City monster flick featuring Quetzalcoatl*** As two Manhattan detectives (David Carradine and Richard Roundtree) investigate deaths linked to Aztecan ritual a huge winged serpent begins preying on citizens. A piano-playing street thug (Michael Moriarty) claims to know where its nest is located and makes a deal with the authorities…

This could have been so much better if the casting were not so dreadful. As it is, it's only a passable adventure that sees two cops - David Carradine and Richard Rowntree on the case of a murderer who ruthlessly decapitates his victims - usually whilst they are seemingly impregnable on a rooftop, or somewhere equally lofty. Meantime, "Quinn" (Mich…